diff --git a/packages/react-native/Libraries/ActionSheetIOS/React-RCTActionSheet.podspec b/packages/react-native/Libraries/ActionSheetIOS/React-RCTActionSheet.podspec
index 06852c0a06eb..5993899241eb 100644
--- a/packages/react-native/Libraries/ActionSheetIOS/React-RCTActionSheet.podspec
+++ b/packages/react-native/Libraries/ActionSheetIOS/React-RCTActionSheet.podspec
@@ -31,4 +31,6 @@ Pod::Spec.new do |s|
   s.header_dir             = "RCTActionSheet"
 
   s.dependency "React-Core/RCTActionSheetHeaders", version
+
+  mark_as_react_native_build(s)
 end
diff --git a/packages/react-native/Libraries/AppDelegate/React-RCTAppDelegate.podspec b/packages/react-native/Libraries/AppDelegate/React-RCTAppDelegate.podspec
index c4322bc2c36b..64172f4cc59c 100644
--- a/packages/react-native/Libraries/AppDelegate/React-RCTAppDelegate.podspec
+++ b/packages/react-native/Libraries/AppDelegate/React-RCTAppDelegate.podspec
@@ -86,4 +86,6 @@ Pod::Spec.new do |s|
   depend_on_js_engine(s)
   add_rn_third_party_dependencies(s)
   add_rncore_dependency(s)
+
+  mark_as_react_native_build(s)
 end
diff --git a/packages/react-native/Libraries/Blob/React-RCTBlob.podspec b/packages/react-native/Libraries/Blob/React-RCTBlob.podspec
index b0cab4521289..344e63726777 100644
--- a/packages/react-native/Libraries/Blob/React-RCTBlob.podspec
+++ b/packages/react-native/Libraries/Blob/React-RCTBlob.podspec
@@ -56,4 +56,6 @@ Pod::Spec.new do |s|
 
   add_rn_third_party_dependencies(s)
   add_rncore_dependency(s)
+
+  mark_as_react_native_build(s)
 end
diff --git a/packages/react-native/Libraries/FBLazyVector/FBLazyVector.podspec b/packages/react-native/Libraries/FBLazyVector/FBLazyVector.podspec
index c8596ac37ec7..1f5794175699 100644
--- a/packages/react-native/Libraries/FBLazyVector/FBLazyVector.podspec
+++ b/packages/react-native/Libraries/FBLazyVector/FBLazyVector.podspec
@@ -28,4 +28,5 @@ Pod::Spec.new do |s|
   s.source_files           = podspec_sources("**/*.{c,h,m,mm,cpp}", "**/*.h")
   s.header_dir             = "FBLazyVector"
 
+  mark_as_react_native_build(s)
 end
diff --git a/packages/react-native/Libraries/Image/React-RCTImage.podspec b/packages/react-native/Libraries/Image/React-RCTImage.podspec
index f2692e24c24d..a51db71640aa 100644
--- a/packages/react-native/Libraries/Image/React-RCTImage.podspec
+++ b/packages/react-native/Libraries/Image/React-RCTImage.podspec
@@ -54,4 +54,6 @@ Pod::Spec.new do |s|
 
   add_rn_third_party_dependencies(s)
   add_rncore_dependency(s)
+
+  mark_as_react_native_build(s)
 end
diff --git a/packages/react-native/Libraries/LinkingIOS/React-RCTLinking.podspec b/packages/react-native/Libraries/LinkingIOS/React-RCTLinking.podspec
index 370b6b93d96c..a9aed670dab3 100644
--- a/packages/react-native/Libraries/LinkingIOS/React-RCTLinking.podspec
+++ b/packages/react-native/Libraries/LinkingIOS/React-RCTLinking.podspec
@@ -48,4 +48,6 @@ Pod::Spec.new do |s|
   add_dependency(s, "React-RCTFBReactNativeSpec")
   add_dependency(s, "ReactCommon", :subspec => "turbomodule/core", :additional_framework_paths => ["react/nativemodule/core"])
   add_dependency(s, "React-NativeModulesApple", :additional_framework_paths => ["build/generated/ios"])
+
+  mark_as_react_native_build(s)
 end
diff --git a/packages/react-native/Libraries/NativeAnimation/React-RCTAnimation.podspec b/packages/react-native/Libraries/NativeAnimation/React-RCTAnimation.podspec
index 0f875f66b0cb..14725f8d625e 100644
--- a/packages/react-native/Libraries/NativeAnimation/React-RCTAnimation.podspec
+++ b/packages/react-native/Libraries/NativeAnimation/React-RCTAnimation.podspec
@@ -52,4 +52,6 @@ Pod::Spec.new do |s|
 
   add_rn_third_party_dependencies(s)
   add_rncore_dependency(s)
+
+  mark_as_react_native_build(s)
 end
diff --git a/packages/react-native/Libraries/Network/React-RCTNetwork.podspec b/packages/react-native/Libraries/Network/React-RCTNetwork.podspec
index 8bc86ff004c4..b5da7fb950d6 100644
--- a/packages/react-native/Libraries/Network/React-RCTNetwork.podspec
+++ b/packages/react-native/Libraries/Network/React-RCTNetwork.podspec
@@ -54,4 +54,6 @@ Pod::Spec.new do |s|
 
   add_rn_third_party_dependencies(s)
   add_rncore_dependency(s)
+
+  mark_as_react_native_build(s)
 end
diff --git a/packages/react-native/Libraries/PushNotificationIOS/React-RCTPushNotification.podspec b/packages/react-native/Libraries/PushNotificationIOS/React-RCTPushNotification.podspec
index ffdf21320f66..1de0c7064efb 100644
--- a/packages/react-native/Libraries/PushNotificationIOS/React-RCTPushNotification.podspec
+++ b/packages/react-native/Libraries/PushNotificationIOS/React-RCTPushNotification.podspec
@@ -50,4 +50,6 @@ Pod::Spec.new do |s|
   add_dependency(s, "React-NativeModulesApple")
 
   add_rncore_dependency(s)
+
+  mark_as_react_native_build(s)
 end
diff --git a/packages/react-native/Libraries/Required/RCTRequired.podspec b/packages/react-native/Libraries/Required/RCTRequired.podspec
index bf8d0300c6a3..3f33ba5790ac 100644
--- a/packages/react-native/Libraries/Required/RCTRequired.podspec
+++ b/packages/react-native/Libraries/Required/RCTRequired.podspec
@@ -27,4 +27,6 @@ Pod::Spec.new do |s|
   s.source                 = source
   s.source_files           = podspec_sources("**/*.{c,h,m,mm,cpp}", "**/*.h")
   s.header_dir             = "RCTRequired"
+
+  mark_as_react_native_build(s)
 end
diff --git a/packages/react-native/Libraries/Settings/React-RCTSettings.podspec b/packages/react-native/Libraries/Settings/React-RCTSettings.podspec
index 8bd2c214f601..c721ace08e5d 100644
--- a/packages/react-native/Libraries/Settings/React-RCTSettings.podspec
+++ b/packages/react-native/Libraries/Settings/React-RCTSettings.podspec
@@ -50,4 +50,6 @@ Pod::Spec.new do |s|
 
   add_rn_third_party_dependencies(s)
   add_rncore_dependency(s)
+
+  mark_as_react_native_build(s)
 end
diff --git a/packages/react-native/Libraries/Text/React-RCTText.podspec b/packages/react-native/Libraries/Text/React-RCTText.podspec
index e2240cf1fe6d..4d9bc4d8f9e7 100644
--- a/packages/react-native/Libraries/Text/React-RCTText.podspec
+++ b/packages/react-native/Libraries/Text/React-RCTText.podspec
@@ -34,4 +34,6 @@ Pod::Spec.new do |s|
 
   s.dependency "Yoga"
   s.dependency "React-Core/RCTTextHeaders", version
+
+  mark_as_react_native_build(s)
 end
diff --git a/packages/react-native/Libraries/TypeSafety/RCTTypeSafety.podspec b/packages/react-native/Libraries/TypeSafety/RCTTypeSafety.podspec
index 2d4ca98dc64f..5b4d0d4b2dbb 100644
--- a/packages/react-native/Libraries/TypeSafety/RCTTypeSafety.podspec
+++ b/packages/react-native/Libraries/TypeSafety/RCTTypeSafety.podspec
@@ -36,4 +36,6 @@ Pod::Spec.new do |s|
   s.dependency "FBLazyVector", version
   s.dependency "RCTRequired", version
   s.dependency "React-Core", version
+
+  mark_as_react_native_build(s)
 end
diff --git a/packages/react-native/Libraries/Vibration/React-RCTVibration.podspec b/packages/react-native/Libraries/Vibration/React-RCTVibration.podspec
index 9768c13d4b38..7ec8ffe35e1f 100644
--- a/packages/react-native/Libraries/Vibration/React-RCTVibration.podspec
+++ b/packages/react-native/Libraries/Vibration/React-RCTVibration.podspec
@@ -50,4 +50,6 @@ Pod::Spec.new do |s|
 
   add_rn_third_party_dependencies(s)
   add_rncore_dependency(s)
+
+  mark_as_react_native_build(s)
 end
diff --git a/packages/react-native/Package.swift b/packages/react-native/Package.swift
index 57ec592fd570..d6e77e2e532c 100644
--- a/packages/react-native/Package.swift
+++ b/packages/react-native/Package.swift
@@ -948,6 +948,10 @@ extension Target {
         CXXSetting.headerSearchPath(relativeSearchPath(numOfSlash + 1, ".build/headers/React")),
       ]
 
+    // Every target built through this factory is React Native's own, so RN_BUILDING
+    // keeps the react/cxxstableapi guards inert for internal sources. cxxSettings are
+    // per-target and are not inherited by packages that depend on React, so this does
+    // not exempt consumers from the guards.
     let cxxSettings =
       [
         .unsafeFlags(["-std=c++20"]),
@@ -956,6 +960,7 @@ extension Target {
         .define("USE_HERMES", to: "1"),
         .define("RCT_REMOVE_LEGACY_ARCH", to: "1"),
         .define("HERMES_V1_ENABLED", to: "1"),
+        .define("RN_BUILDING", to: "1"),
       ] + defines + cxxCommonHeaderPaths
 
     return .target(
diff --git a/packages/react-native/React-Core-prebuilt.podspec b/packages/react-native/React-Core-prebuilt.podspec
index bc838fafef3a..81ffdbd933d9 100644
--- a/packages/react-native/React-Core-prebuilt.podspec
+++ b/packages/react-native/React-Core-prebuilt.podspec
@@ -103,4 +103,6 @@ Pod::Spec.new do |s|
 
     s.script_phase = script_phase
   end
+
+  mark_as_react_native_build(s)
 end
diff --git a/packages/react-native/React-Core.podspec b/packages/react-native/React-Core.podspec
index 88115a1790ec..4e5802e7035d 100644
--- a/packages/react-native/React-Core.podspec
+++ b/packages/react-native/React-Core.podspec
@@ -141,4 +141,6 @@ Pod::Spec.new do |s|
   depend_on_js_engine(s)
   add_rn_third_party_dependencies(s)
   add_rncore_dependency(s)
+
+  mark_as_react_native_build(s)
 end
diff --git a/packages/react-native/React.podspec b/packages/react-native/React.podspec
index 59b9f8319ae3..a7e68f9c6506 100644
--- a/packages/react-native/React.podspec
+++ b/packages/react-native/React.podspec
@@ -53,4 +53,6 @@ Pod::Spec.new do |s|
   s.dependency "React-RCTSettings", version
   s.dependency "React-RCTText", version
   s.dependency "React-RCTVibration", version
+
+  mark_as_react_native_build(s)
 end
diff --git a/packages/react-native/React/CoreModules/React-CoreModules.podspec b/packages/react-native/React/CoreModules/React-CoreModules.podspec
index 2d8b9aa21d12..215fee2e474a 100644
--- a/packages/react-native/React/CoreModules/React-CoreModules.podspec
+++ b/packages/react-native/React/CoreModules/React-CoreModules.podspec
@@ -67,4 +67,6 @@ Pod::Spec.new do |s|
 
   add_rn_third_party_dependencies(s)
   add_rncore_dependency(s)
+
+  mark_as_react_native_build(s)
 end
diff --git a/packages/react-native/React/React-RCTFBReactNativeSpec.podspec b/packages/react-native/React/React-RCTFBReactNativeSpec.podspec
index f9978b78aca4..9f9901674043 100644
--- a/packages/react-native/React/React-RCTFBReactNativeSpec.podspec
+++ b/packages/react-native/React/React-RCTFBReactNativeSpec.podspec
@@ -92,4 +92,6 @@ fi
       EOS
     }
   ]
+
+  mark_as_react_native_build(s)
 end
diff --git a/packages/react-native/React/React-RCTFabric.podspec b/packages/react-native/React/React-RCTFabric.podspec
index c6cd5687f2d6..58d13ad3bcdf 100644
--- a/packages/react-native/React/React-RCTFabric.podspec
+++ b/packages/react-native/React/React-RCTFabric.podspec
@@ -109,4 +109,6 @@ Pod::Spec.new do |s|
     test_spec.source_files = podspec_sources("Tests/**/*.{mm}", "")
     test_spec.framework = "XCTest"
   end
+
+  mark_as_react_native_build(s)
 end
diff --git a/packages/react-native/React/Runtime/React-RCTRuntime.podspec b/packages/react-native/React/Runtime/React-RCTRuntime.podspec
index 76b745957eb5..df1413eafa68 100644
--- a/packages/react-native/React/Runtime/React-RCTRuntime.podspec
+++ b/packages/react-native/React/Runtime/React-RCTRuntime.podspec
@@ -69,4 +69,6 @@ Pod::Spec.new do |s|
   depend_on_js_engine(s)
   add_rn_third_party_dependencies(s)
   add_rncore_dependency(s)
+
+  mark_as_react_native_build(s)
 end
diff --git a/packages/react-native/ReactAndroid/src/main/jni/CMakeLists.txt b/packages/react-native/ReactAndroid/src/main/jni/CMakeLists.txt
index 00bbc586170d..9fad7aff3108 100644
--- a/packages/react-native/ReactAndroid/src/main/jni/CMakeLists.txt
+++ b/packages/react-native/ReactAndroid/src/main/jni/CMakeLists.txt
@@ -58,6 +58,14 @@ add_react_third_party_ndk_subdir(fast_float)
 add_react_third_party_ndk_subdir(fmt)
 add_react_third_party_ndk_subdir(folly)
 
+# Marks everything added below as React Native's own build, so the
+# react/cxxstableapi guards let internal sources keep including the
+# fine-grained headers they fence off from consumers. Deliberately declared
+# after the third-party subdirectories so it never reaches them, and this
+# project never compiles app or third-party module code (those build against
+# the prefab artifacts through ReactNative-application.cmake).
+add_compile_definitions(RN_BUILDING)
+
 # Common targets
 add_react_common_subdir(yoga)
 add_react_common_subdir(runtimeexecutor)
diff --git a/packages/react-native/ReactApple/Libraries/RCTFoundation/RCTDeprecation/RCTDeprecation.podspec b/packages/react-native/ReactApple/Libraries/RCTFoundation/RCTDeprecation/RCTDeprecation.podspec
index 303ca62dc681..57bce8e5e11a 100644
--- a/packages/react-native/ReactApple/Libraries/RCTFoundation/RCTDeprecation/RCTDeprecation.podspec
+++ b/packages/react-native/ReactApple/Libraries/RCTFoundation/RCTDeprecation/RCTDeprecation.podspec
@@ -22,4 +22,6 @@ Pod::Spec.new do |s|
       "CLANG_CXX_LANGUAGE_STANDARD" => rct_cxx_language_standard()
     }
     s.compiler_flags         = "-Wnullable-to-nonnull-conversion -Wnullability-completeness"
+
+    mark_as_react_native_build(s)
   end
diff --git a/packages/react-native/ReactApple/RCTAnimatedModuleProvider/React-RCTAnimatedModuleProvider.podspec b/packages/react-native/ReactApple/RCTAnimatedModuleProvider/React-RCTAnimatedModuleProvider.podspec
index c7b786268930..f71dd4e6ae89 100644
--- a/packages/react-native/ReactApple/RCTAnimatedModuleProvider/React-RCTAnimatedModuleProvider.podspec
+++ b/packages/react-native/ReactApple/RCTAnimatedModuleProvider/React-RCTAnimatedModuleProvider.podspec
@@ -60,4 +60,6 @@ Pod::Spec.new do |s|
   depend_on_js_engine(s)
   add_rn_third_party_dependencies(s)
   add_rncore_dependency(s)
+
+  mark_as_react_native_build(s)
 end
diff --git a/packages/react-native/ReactApple/RCTSwiftUI/RCTSwiftUI.podspec b/packages/react-native/ReactApple/RCTSwiftUI/RCTSwiftUI.podspec
index c0b07cd6d9a8..9fcc6b91136d 100644
--- a/packages/react-native/ReactApple/RCTSwiftUI/RCTSwiftUI.podspec
+++ b/packages/react-native/ReactApple/RCTSwiftUI/RCTSwiftUI.podspec
@@ -36,4 +36,5 @@ Pod::Spec.new do |s|
     "DEFINES_MODULE" => "YES",
   }
 
+  mark_as_react_native_build(s)
 end
diff --git a/packages/react-native/ReactApple/RCTSwiftUIWrapper/RCTSwiftUIWrapper.podspec b/packages/react-native/ReactApple/RCTSwiftUIWrapper/RCTSwiftUIWrapper.podspec
index 135b2bb5ccb0..ac83cb032d13 100644
--- a/packages/react-native/ReactApple/RCTSwiftUIWrapper/RCTSwiftUIWrapper.podspec
+++ b/packages/react-native/ReactApple/RCTSwiftUIWrapper/RCTSwiftUIWrapper.podspec
@@ -34,4 +34,5 @@ Pod::Spec.new do |s|
     "SWIFT_VERSION" => "5.0",
   }
 
+  mark_as_react_native_build(s)
 end
diff --git a/packages/react-native/ReactCommon/React-Fabric.podspec b/packages/react-native/ReactCommon/React-Fabric.podspec
index 183c039786eb..6cfa9af4028b 100644
--- a/packages/react-native/ReactCommon/React-Fabric.podspec
+++ b/packages/react-native/ReactCommon/React-Fabric.podspec
@@ -236,4 +236,6 @@ Pod::Spec.new do |s|
     ss.source_files         = podspec_sources("react/renderer/viewtransition/**/*.{m,mm,cpp,h}", "react/renderer/viewtransition/**/*.h")
     ss.header_dir           = "react/renderer/viewtransition"
   end
+
+  mark_as_react_native_build(s)
 end
diff --git a/packages/react-native/ReactCommon/React-FabricComponents.podspec b/packages/react-native/ReactCommon/React-FabricComponents.podspec
index b6a28b32d05a..3113cbcda627 100644
--- a/packages/react-native/ReactCommon/React-FabricComponents.podspec
+++ b/packages/react-native/ReactCommon/React-FabricComponents.podspec
@@ -160,4 +160,6 @@ Pod::Spec.new do |s|
                               "react/renderer/textlayoutmanager/platform/cxx"
     ss.header_dir           = "react/renderer/textlayoutmanager"
   end
+
+  mark_as_react_native_build(s)
 end
diff --git a/packages/react-native/ReactCommon/React-FabricImage.podspec b/packages/react-native/ReactCommon/React-FabricImage.podspec
index 588b4c4d104b..8182a11a5a74 100644
--- a/packages/react-native/ReactCommon/React-FabricImage.podspec
+++ b/packages/react-native/ReactCommon/React-FabricImage.podspec
@@ -76,4 +76,6 @@ Pod::Spec.new do |s|
   depend_on_js_engine(s)
   add_rn_third_party_dependencies(s)
   add_rncore_dependency(s)
+
+  mark_as_react_native_build(s)
 end
diff --git a/packages/react-native/ReactCommon/React-Mapbuffer.podspec b/packages/react-native/ReactCommon/React-Mapbuffer.podspec
index 6df5afd9f1e2..74cef67a4e40 100644
--- a/packages/react-native/ReactCommon/React-Mapbuffer.podspec
+++ b/packages/react-native/ReactCommon/React-Mapbuffer.podspec
@@ -37,4 +37,6 @@ Pod::Spec.new do |s|
   add_dependency(s, "React-debug")
   add_rn_third_party_dependencies(s)
   add_rncore_dependency(s)
+
+  mark_as_react_native_build(s)
 end
diff --git a/packages/react-native/ReactCommon/ReactCommon.podspec b/packages/react-native/ReactCommon/ReactCommon.podspec
index a6a9ce6b5668..4e3896458af2 100644
--- a/packages/react-native/ReactCommon/ReactCommon.podspec
+++ b/packages/react-native/ReactCommon/ReactCommon.podspec
@@ -59,4 +59,6 @@ Pod::Spec.new do |s|
       sss.dependency "React-utils", version
     end
   end
+
+  mark_as_react_native_build(s)
 end
diff --git a/packages/react-native/ReactCommon/callinvoker/React-callinvoker.podspec b/packages/react-native/ReactCommon/callinvoker/React-callinvoker.podspec
index 33be754b541f..6290d9867e6d 100644
--- a/packages/react-native/ReactCommon/callinvoker/React-callinvoker.podspec
+++ b/packages/react-native/ReactCommon/callinvoker/React-callinvoker.podspec
@@ -27,4 +27,6 @@ Pod::Spec.new do |s|
   s.source                 = source
   s.source_files           = podspec_sources("**/*.{cpp,h}", "**/*.h")
   s.header_dir             = "ReactCommon"
+
+  mark_as_react_native_build(s)
 end
diff --git a/packages/react-native/ReactCommon/cxxreact/React-cxxreact.podspec b/packages/react-native/ReactCommon/cxxreact/React-cxxreact.podspec
index afb31b539288..13b99d6fe617 100644
--- a/packages/react-native/ReactCommon/cxxreact/React-cxxreact.podspec
+++ b/packages/react-native/ReactCommon/cxxreact/React-cxxreact.podspec
@@ -55,4 +55,6 @@ Pod::Spec.new do |s|
 
   add_rn_third_party_dependencies(s)
   add_rncore_dependency(s)
+
+  mark_as_react_native_build(s)
 end
diff --git a/packages/react-native/ReactCommon/hermes/React-hermes.podspec b/packages/react-native/ReactCommon/hermes/React-hermes.podspec
index 4a2a8533e38b..8b95c8221375 100644
--- a/packages/react-native/ReactCommon/hermes/React-hermes.podspec
+++ b/packages/react-native/ReactCommon/hermes/React-hermes.podspec
@@ -51,4 +51,6 @@ Pod::Spec.new do |s|
 
   add_rn_third_party_dependencies(s)
   add_rncore_dependency(s)
+
+  mark_as_react_native_build(s)
 end
diff --git a/packages/react-native/ReactCommon/hermes/executor/React-jsitracing.podspec b/packages/react-native/ReactCommon/hermes/executor/React-jsitracing.podspec
index 9ee322ba4489..04a895cc5d1a 100644
--- a/packages/react-native/ReactCommon/hermes/executor/React-jsitracing.podspec
+++ b/packages/react-native/ReactCommon/hermes/executor/React-jsitracing.podspec
@@ -35,4 +35,6 @@ Pod::Spec.new do |s|
   resolve_use_frameworks(s, header_mappings_dir: './', module_name: "React_jsitracing")
 
   s.dependency "React-jsi"
+
+  mark_as_react_native_build(s)
 end
diff --git a/packages/react-native/ReactCommon/jserrorhandler/React-jserrorhandler.podspec b/packages/react-native/ReactCommon/jserrorhandler/React-jserrorhandler.podspec
index 9560c5c66133..41b1b9eb20e5 100644
--- a/packages/react-native/ReactCommon/jserrorhandler/React-jserrorhandler.podspec
+++ b/packages/react-native/ReactCommon/jserrorhandler/React-jserrorhandler.podspec
@@ -48,4 +48,5 @@ Pod::Spec.new do |s|
   add_rn_third_party_dependencies(s)
   add_rncore_dependency(s)
 
+  mark_as_react_native_build(s)
 end
diff --git a/packages/react-native/ReactCommon/jsi/React-jsi.podspec b/packages/react-native/ReactCommon/jsi/React-jsi.podspec
index 60e18530c97a..5fa453999308 100644
--- a/packages/react-native/ReactCommon/jsi/React-jsi.podspec
+++ b/packages/react-native/ReactCommon/jsi/React-jsi.podspec
@@ -47,4 +47,6 @@ Pod::Spec.new do |s|
 
   add_rn_third_party_dependencies(s)
   add_rncore_dependency(s)
+
+  mark_as_react_native_build(s)
 end
diff --git a/packages/react-native/ReactCommon/jsiexecutor/React-jsiexecutor.podspec b/packages/react-native/ReactCommon/jsiexecutor/React-jsiexecutor.podspec
index c737b2f516ee..6ceb245318d1 100644
--- a/packages/react-native/ReactCommon/jsiexecutor/React-jsiexecutor.podspec
+++ b/packages/react-native/ReactCommon/jsiexecutor/React-jsiexecutor.podspec
@@ -48,4 +48,6 @@ Pod::Spec.new do |s|
 
   add_rn_third_party_dependencies(s)
   add_rncore_dependency(s)
+
+  mark_as_react_native_build(s)
 end
diff --git a/packages/react-native/ReactCommon/jsinspector-modern/React-jsinspector.podspec b/packages/react-native/ReactCommon/jsinspector-modern/React-jsinspector.podspec
index 770c30f15004..028ffc3b4f18 100644
--- a/packages/react-native/ReactCommon/jsinspector-modern/React-jsinspector.podspec
+++ b/packages/react-native/ReactCommon/jsinspector-modern/React-jsinspector.podspec
@@ -62,4 +62,6 @@ Pod::Spec.new do |s|
 
   add_rn_third_party_dependencies(s)
   add_rncore_dependency(s)
+
+  mark_as_react_native_build(s)
 end
diff --git a/packages/react-native/ReactCommon/jsinspector-modern/cdp/React-jsinspectorcdp.podspec b/packages/react-native/ReactCommon/jsinspector-modern/cdp/React-jsinspectorcdp.podspec
index cff367fda21e..8a7eaf0496d1 100644
--- a/packages/react-native/ReactCommon/jsinspector-modern/cdp/React-jsinspectorcdp.podspec
+++ b/packages/react-native/ReactCommon/jsinspector-modern/cdp/React-jsinspectorcdp.podspec
@@ -45,4 +45,6 @@ Pod::Spec.new do |s|
 
   add_rn_third_party_dependencies(s)
   add_rncore_dependency(s)
+
+  mark_as_react_native_build(s)
 end
diff --git a/packages/react-native/ReactCommon/jsinspector-modern/network/React-jsinspectornetwork.podspec b/packages/react-native/ReactCommon/jsinspector-modern/network/React-jsinspectornetwork.podspec
index c3cc232eb71b..305f80846b36 100644
--- a/packages/react-native/ReactCommon/jsinspector-modern/network/React-jsinspectornetwork.podspec
+++ b/packages/react-native/ReactCommon/jsinspector-modern/network/React-jsinspectornetwork.podspec
@@ -47,4 +47,6 @@ Pod::Spec.new do |s|
 
   add_rn_third_party_dependencies(s)
   add_rncore_dependency(s)
+
+  mark_as_react_native_build(s)
 end
diff --git a/packages/react-native/ReactCommon/jsinspector-modern/tracing/React-jsinspectortracing.podspec b/packages/react-native/ReactCommon/jsinspector-modern/tracing/React-jsinspectortracing.podspec
index 1b988ab698c7..455d12c8fdef 100644
--- a/packages/react-native/ReactCommon/jsinspector-modern/tracing/React-jsinspectortracing.podspec
+++ b/packages/react-native/ReactCommon/jsinspector-modern/tracing/React-jsinspectortracing.podspec
@@ -55,4 +55,6 @@ Pod::Spec.new do |s|
 
   add_rn_third_party_dependencies(s)
   add_rncore_dependency(s)
+
+  mark_as_react_native_build(s)
 end
diff --git a/packages/react-native/ReactCommon/jsitooling/React-jsitooling.podspec b/packages/react-native/ReactCommon/jsitooling/React-jsitooling.podspec
index c6a0d7ae7faa..12d77fbab6ba 100644
--- a/packages/react-native/ReactCommon/jsitooling/React-jsitooling.podspec
+++ b/packages/react-native/ReactCommon/jsitooling/React-jsitooling.podspec
@@ -50,4 +50,6 @@ Pod::Spec.new do |s|
 
   add_rn_third_party_dependencies(s)
   add_rncore_dependency(s)
+
+  mark_as_react_native_build(s)
 end
diff --git a/packages/react-native/ReactCommon/logger/React-logger.podspec b/packages/react-native/ReactCommon/logger/React-logger.podspec
index d83e10202c61..771445962e6a 100644
--- a/packages/react-native/ReactCommon/logger/React-logger.podspec
+++ b/packages/react-native/ReactCommon/logger/React-logger.podspec
@@ -31,4 +31,6 @@ Pod::Spec.new do |s|
 
   add_rn_third_party_dependencies(s)
   add_rncore_dependency(s)
+
+  mark_as_react_native_build(s)
 end
diff --git a/packages/react-native/ReactCommon/oscompat/React-oscompat.podspec b/packages/react-native/ReactCommon/oscompat/React-oscompat.podspec
index 74a0abe3b6c3..73d033c29a43 100644
--- a/packages/react-native/ReactCommon/oscompat/React-oscompat.podspec
+++ b/packages/react-native/ReactCommon/oscompat/React-oscompat.podspec
@@ -28,4 +28,6 @@ Pod::Spec.new do |s|
   s.source_files           = podspec_sources("*.{cpp,h}", "*.{h}")
   s.pod_target_xcconfig    = { "HEADER_SEARCH_PATHS" => "" }
   s.header_dir             = "oscompat"
+
+  mark_as_react_native_build(s)
 end
diff --git a/packages/react-native/ReactCommon/react/bridging/React-bridging.podspec b/packages/react-native/ReactCommon/react/bridging/React-bridging.podspec
index 9e79373a2aae..3a47aa4d2915 100644
--- a/packages/react-native/ReactCommon/react/bridging/React-bridging.podspec
+++ b/packages/react-native/ReactCommon/react/bridging/React-bridging.podspec
@@ -41,4 +41,6 @@ Pod::Spec.new do |s|
 
   add_rn_third_party_dependencies(s)
   add_rncore_dependency(s)
+
+  mark_as_react_native_build(s)
 end
diff --git a/packages/react-native/ReactCommon/react/cxxstableapi/React-cxxstableapi.podspec b/packages/react-native/ReactCommon/react/cxxstableapi/React-cxxstableapi.podspec
index 5824fb5da97a..155249286504 100644
--- a/packages/react-native/ReactCommon/react/cxxstableapi/React-cxxstableapi.podspec
+++ b/packages/react-native/ReactCommon/react/cxxstableapi/React-cxxstableapi.podspec
@@ -31,4 +31,6 @@ Pod::Spec.new do |s|
                                "DEFINES_MODULE" => "YES" }
 
   resolve_use_frameworks(s, header_mappings_dir: "../..", module_name: "React_cxxstableapi")
+
+  mark_as_react_native_build(s)
 end
diff --git a/packages/react-native/ReactCommon/react/debug/React-debug.podspec b/packages/react-native/ReactCommon/react/debug/React-debug.podspec
index 8d1d3dc0f51c..b2ec229a73cf 100644
--- a/packages/react-native/ReactCommon/react/debug/React-debug.podspec
+++ b/packages/react-native/ReactCommon/react/debug/React-debug.podspec
@@ -37,4 +37,6 @@ Pod::Spec.new do |s|
     ss.exclude_files        = "redbox/tests/**/*.{cpp,h}"
     ss.header_dir           = "react/debug/redbox"
   end
+
+  mark_as_react_native_build(s)
 end
diff --git a/packages/react-native/ReactCommon/react/featureflags/React-featureflags.podspec b/packages/react-native/ReactCommon/react/featureflags/React-featureflags.podspec
index 274177995178..52806c37c732 100644
--- a/packages/react-native/ReactCommon/react/featureflags/React-featureflags.podspec
+++ b/packages/react-native/ReactCommon/react/featureflags/React-featureflags.podspec
@@ -41,4 +41,6 @@ Pod::Spec.new do |s|
 
   add_rn_third_party_dependencies(s)
   add_rncore_dependency(s)
+
+  mark_as_react_native_build(s)
 end
diff --git a/packages/react-native/ReactCommon/react/nativemodule/core/platform/ios/React-NativeModulesApple.podspec b/packages/react-native/ReactCommon/react/nativemodule/core/platform/ios/React-NativeModulesApple.podspec
index 92bf47ef5764..3a9bde9b2591 100644
--- a/packages/react-native/ReactCommon/react/nativemodule/core/platform/ios/React-NativeModulesApple.podspec
+++ b/packages/react-native/ReactCommon/react/nativemodule/core/platform/ios/React-NativeModulesApple.podspec
@@ -52,4 +52,6 @@ Pod::Spec.new do |s|
     depend_on_js_engine(s)
     add_rn_third_party_dependencies(s)
     add_rncore_dependency(s)
+
+  mark_as_react_native_build(s)
 end
diff --git a/packages/react-native/ReactCommon/react/nativemodule/defaults/React-defaultsnativemodule.podspec b/packages/react-native/ReactCommon/react/nativemodule/defaults/React-defaultsnativemodule.podspec
index e68eb7c530a4..5c159feb912e 100644
--- a/packages/react-native/ReactCommon/react/nativemodule/defaults/React-defaultsnativemodule.podspec
+++ b/packages/react-native/ReactCommon/react/nativemodule/defaults/React-defaultsnativemodule.podspec
@@ -60,4 +60,6 @@ Pod::Spec.new do |s|
   add_dependency(s, "React-RCTFBReactNativeSpec")
   add_dependency(s, "React-featureflags")
   add_dependency(s, "React-featureflagsnativemodule")
+
+  mark_as_react_native_build(s)
 end
diff --git a/packages/react-native/ReactCommon/react/nativemodule/dom/React-domnativemodule.podspec b/packages/react-native/ReactCommon/react/nativemodule/dom/React-domnativemodule.podspec
index 6cc38a3b0fa7..c76d33856eae 100644
--- a/packages/react-native/ReactCommon/react/nativemodule/dom/React-domnativemodule.podspec
+++ b/packages/react-native/ReactCommon/react/nativemodule/dom/React-domnativemodule.podspec
@@ -58,4 +58,6 @@ Pod::Spec.new do |s|
   add_dependency(s, "React-runtimeexecutor", :additional_framework_paths => ["platform/ios"])
   add_dependency(s, "React-graphics", :additional_framework_paths => ["react/renderer/graphics/platform/ios"])
   add_dependency(s, "React-RCTFBReactNativeSpec")
+
+  mark_as_react_native_build(s)
 end
diff --git a/packages/react-native/ReactCommon/react/nativemodule/featureflags/React-featureflagsnativemodule.podspec b/packages/react-native/ReactCommon/react/nativemodule/featureflags/React-featureflagsnativemodule.podspec
index 6d4dafcc7076..6aab73bcac0e 100644
--- a/packages/react-native/ReactCommon/react/nativemodule/featureflags/React-featureflagsnativemodule.podspec
+++ b/packages/react-native/ReactCommon/react/nativemodule/featureflags/React-featureflagsnativemodule.podspec
@@ -50,4 +50,6 @@ Pod::Spec.new do |s|
   s.dependency "ReactCommon/turbomodule/core"
   s.dependency "React-RCTFBReactNativeSpec"
   s.dependency "React-featureflags"
+
+  mark_as_react_native_build(s)
 end
diff --git a/packages/react-native/ReactCommon/react/nativemodule/idlecallbacks/React-idlecallbacksnativemodule.podspec b/packages/react-native/ReactCommon/react/nativemodule/idlecallbacks/React-idlecallbacksnativemodule.podspec
index 654e412d5fea..a12c88293416 100644
--- a/packages/react-native/ReactCommon/react/nativemodule/idlecallbacks/React-idlecallbacksnativemodule.podspec
+++ b/packages/react-native/ReactCommon/react/nativemodule/idlecallbacks/React-idlecallbacksnativemodule.podspec
@@ -53,4 +53,5 @@ Pod::Spec.new do |s|
   add_dependency(s, "React-RCTFBReactNativeSpec")
   add_dependency(s, "React-runtimeexecutor", :additional_framework_paths => ["platform/ios"])
 
+  mark_as_react_native_build(s)
 end
diff --git a/packages/react-native/ReactCommon/react/nativemodule/intersectionobserver/React-intersectionobservernativemodule.podspec b/packages/react-native/ReactCommon/react/nativemodule/intersectionobserver/React-intersectionobservernativemodule.podspec
index 4a98cc332a52..d390a2844ba0 100644
--- a/packages/react-native/ReactCommon/react/nativemodule/intersectionobserver/React-intersectionobservernativemodule.podspec
+++ b/packages/react-native/ReactCommon/react/nativemodule/intersectionobserver/React-intersectionobservernativemodule.podspec
@@ -64,4 +64,5 @@ Pod::Spec.new do |s|
   add_dependency(s, "React-runtimeexecutor", :additional_framework_paths => ["platform/ios"])
   add_dependency(s, "React-graphics", :additional_framework_paths => ["react/renderer/graphics/platform/ios"])
 
+  mark_as_react_native_build(s)
 end
diff --git a/packages/react-native/ReactCommon/react/nativemodule/microtasks/React-microtasksnativemodule.podspec b/packages/react-native/ReactCommon/react/nativemodule/microtasks/React-microtasksnativemodule.podspec
index a41e3d3a3526..37508bc4344e 100644
--- a/packages/react-native/ReactCommon/react/nativemodule/microtasks/React-microtasksnativemodule.podspec
+++ b/packages/react-native/ReactCommon/react/nativemodule/microtasks/React-microtasksnativemodule.podspec
@@ -49,4 +49,6 @@ Pod::Spec.new do |s|
 
   s.dependency "ReactCommon/turbomodule/core"
   add_dependency(s, "React-RCTFBReactNativeSpec")
+
+  mark_as_react_native_build(s)
 end
diff --git a/packages/react-native/ReactCommon/react/nativemodule/mutationobserver/React-mutationobservernativemodule.podspec b/packages/react-native/ReactCommon/react/nativemodule/mutationobserver/React-mutationobservernativemodule.podspec
index 67b2cbd6052b..6da891d0c7aa 100644
--- a/packages/react-native/ReactCommon/react/nativemodule/mutationobserver/React-mutationobservernativemodule.podspec
+++ b/packages/react-native/ReactCommon/react/nativemodule/mutationobserver/React-mutationobservernativemodule.podspec
@@ -64,4 +64,5 @@ Pod::Spec.new do |s|
   add_dependency(s, "React-RCTFBReactNativeSpec")
   add_dependency(s, "React-runtimeexecutor", :additional_framework_paths => ["platform/ios"])
 
+  mark_as_react_native_build(s)
 end
diff --git a/packages/react-native/ReactCommon/react/nativemodule/samples/ReactCommon-Samples.podspec b/packages/react-native/ReactCommon/react/nativemodule/samples/ReactCommon-Samples.podspec
index ed456acafef4..dc130cdc74ac 100644
--- a/packages/react-native/ReactCommon/react/nativemodule/samples/ReactCommon-Samples.podspec
+++ b/packages/react-native/ReactCommon/react/nativemodule/samples/ReactCommon-Samples.podspec
@@ -61,4 +61,6 @@ Pod::Spec.new do |s|
   depend_on_js_engine(s)
   add_rn_third_party_dependencies(s)
   add_rncore_dependency(s)
+
+  mark_as_react_native_build(s)
 end
diff --git a/packages/react-native/ReactCommon/react/nativemodule/viewtransition/React-viewtransitionnativemodule.podspec b/packages/react-native/ReactCommon/react/nativemodule/viewtransition/React-viewtransitionnativemodule.podspec
index 395b78c4b0d1..2b07c8469a4b 100644
--- a/packages/react-native/ReactCommon/react/nativemodule/viewtransition/React-viewtransitionnativemodule.podspec
+++ b/packages/react-native/ReactCommon/react/nativemodule/viewtransition/React-viewtransitionnativemodule.podspec
@@ -55,4 +55,6 @@ Pod::Spec.new do |s|
   s.dependency "React-Fabric/bridging"
   add_dependency(s, "React-runtimeexecutor", :additional_framework_paths => ["platform/ios"])
   add_dependency(s, "React-RCTFBReactNativeSpec")
+
+  mark_as_react_native_build(s)
 end
diff --git a/packages/react-native/ReactCommon/react/nativemodule/webperformance/React-webperformancenativemodule.podspec b/packages/react-native/ReactCommon/react/nativemodule/webperformance/React-webperformancenativemodule.podspec
index e1615a6ba578..b1d262cf6818 100644
--- a/packages/react-native/ReactCommon/react/nativemodule/webperformance/React-webperformancenativemodule.podspec
+++ b/packages/react-native/ReactCommon/react/nativemodule/webperformance/React-webperformancenativemodule.podspec
@@ -58,4 +58,5 @@ Pod::Spec.new do |s|
   add_dependency(s, "React-performancetimeline")
   add_dependency(s, "React-runtimeexecutor", :additional_framework_paths => ["platform/ios"])
 
+  mark_as_react_native_build(s)
 end
diff --git a/packages/react-native/ReactCommon/react/networking/React-networking.podspec b/packages/react-native/ReactCommon/react/networking/React-networking.podspec
index e8772d03fa2d..2331d3c9ecaf 100644
--- a/packages/react-native/ReactCommon/react/networking/React-networking.podspec
+++ b/packages/react-native/ReactCommon/react/networking/React-networking.podspec
@@ -48,4 +48,6 @@ Pod::Spec.new do |s|
 
   add_rn_third_party_dependencies(s)
   add_rncore_dependency(s)
+
+  mark_as_react_native_build(s)
 end
diff --git a/packages/react-native/ReactCommon/react/performance/cdpmetrics/React-performancecdpmetrics.podspec b/packages/react-native/ReactCommon/react/performance/cdpmetrics/React-performancecdpmetrics.podspec
index 3570820348a4..646855e74b80 100644
--- a/packages/react-native/ReactCommon/react/performance/cdpmetrics/React-performancecdpmetrics.podspec
+++ b/packages/react-native/ReactCommon/react/performance/cdpmetrics/React-performancecdpmetrics.podspec
@@ -50,4 +50,6 @@ Pod::Spec.new do |s|
   if use_hermes()
     s.dependency 'hermes-engine'
   end
+
+  mark_as_react_native_build(s)
 end
diff --git a/packages/react-native/ReactCommon/react/performance/timeline/React-performancetimeline.podspec b/packages/react-native/ReactCommon/react/performance/timeline/React-performancetimeline.podspec
index 31c88d97abe9..ec18c311fe18 100644
--- a/packages/react-native/ReactCommon/react/performance/timeline/React-performancetimeline.podspec
+++ b/packages/react-native/ReactCommon/react/performance/timeline/React-performancetimeline.podspec
@@ -48,4 +48,6 @@ Pod::Spec.new do |s|
 
   add_rn_third_party_dependencies(s)
   add_rncore_dependency(s)
+
+  mark_as_react_native_build(s)
 end
diff --git a/packages/react-native/ReactCommon/react/renderer/consistency/React-rendererconsistency.podspec b/packages/react-native/ReactCommon/react/renderer/consistency/React-rendererconsistency.podspec
index 216fd443ad3c..e4cf09b0d814 100644
--- a/packages/react-native/ReactCommon/react/renderer/consistency/React-rendererconsistency.podspec
+++ b/packages/react-native/ReactCommon/react/renderer/consistency/React-rendererconsistency.podspec
@@ -40,4 +40,5 @@ Pod::Spec.new do |s|
 
   resolve_use_frameworks(s, header_mappings_dir: "../../..", module_name: "React_rendererconsistency")
 
+  mark_as_react_native_build(s)
 end
diff --git a/packages/react-native/ReactCommon/react/renderer/css/React-renderercss.podspec b/packages/react-native/ReactCommon/react/renderer/css/React-renderercss.podspec
index c16a9a875b27..23c37bc980cc 100644
--- a/packages/react-native/ReactCommon/react/renderer/css/React-renderercss.podspec
+++ b/packages/react-native/ReactCommon/react/renderer/css/React-renderercss.podspec
@@ -44,4 +44,6 @@ Pod::Spec.new do |s|
 
   add_dependency(s, "React-debug")
   add_dependency(s, "React-utils")
+
+  mark_as_react_native_build(s)
 end
diff --git a/packages/react-native/ReactCommon/react/renderer/debug/React-rendererdebug.podspec b/packages/react-native/ReactCommon/react/renderer/debug/React-rendererdebug.podspec
index 41df93a4f64a..d53f4077d6c5 100644
--- a/packages/react-native/ReactCommon/react/renderer/debug/React-rendererdebug.podspec
+++ b/packages/react-native/ReactCommon/react/renderer/debug/React-rendererdebug.podspec
@@ -45,4 +45,6 @@ Pod::Spec.new do |s|
   add_dependency(s, "React-debug")
   add_rn_third_party_dependencies(s)
   add_rncore_dependency(s)
+
+  mark_as_react_native_build(s)
 end
diff --git a/packages/react-native/ReactCommon/react/renderer/graphics/React-graphics.podspec b/packages/react-native/ReactCommon/react/renderer/graphics/React-graphics.podspec
index f6265ab54e63..a164d8ef3db1 100644
--- a/packages/react-native/ReactCommon/react/renderer/graphics/React-graphics.podspec
+++ b/packages/react-native/ReactCommon/react/renderer/graphics/React-graphics.podspec
@@ -54,4 +54,6 @@ Pod::Spec.new do |s|
   depend_on_js_engine(s)
   add_rn_third_party_dependencies(s)
   add_rncore_dependency(s)
+
+  mark_as_react_native_build(s)
 end
diff --git a/packages/react-native/ReactCommon/react/renderer/imagemanager/platform/ios/React-ImageManager.podspec b/packages/react-native/ReactCommon/react/renderer/imagemanager/platform/ios/React-ImageManager.podspec
index 50862be68387..440aa113e61c 100644
--- a/packages/react-native/ReactCommon/react/renderer/imagemanager/platform/ios/React-ImageManager.podspec
+++ b/packages/react-native/ReactCommon/react/renderer/imagemanager/platform/ios/React-ImageManager.podspec
@@ -53,4 +53,6 @@ Pod::Spec.new do |s|
 
   add_rn_third_party_dependencies(s)
   add_rncore_dependency(s)
+
+  mark_as_react_native_build(s)
 end
diff --git a/packages/react-native/ReactCommon/react/renderer/runtimescheduler/React-runtimescheduler.podspec b/packages/react-native/ReactCommon/react/renderer/runtimescheduler/React-runtimescheduler.podspec
index 864bd1919ee2..339e7e6e031f 100644
--- a/packages/react-native/ReactCommon/react/renderer/runtimescheduler/React-runtimescheduler.podspec
+++ b/packages/react-native/ReactCommon/react/renderer/runtimescheduler/React-runtimescheduler.podspec
@@ -57,4 +57,6 @@ Pod::Spec.new do |s|
   depend_on_js_engine(s)
   add_rn_third_party_dependencies(s)
   add_rncore_dependency(s)
+
+  mark_as_react_native_build(s)
 end
diff --git a/packages/react-native/ReactCommon/react/runtime/React-RuntimeCore.podspec b/packages/react-native/ReactCommon/react/runtime/React-RuntimeCore.podspec
index 24b163f5e4d4..863168dc0fd2 100644
--- a/packages/react-native/ReactCommon/react/runtime/React-RuntimeCore.podspec
+++ b/packages/react-native/ReactCommon/react/runtime/React-RuntimeCore.podspec
@@ -53,4 +53,6 @@ Pod::Spec.new do |s|
 
   s.dependency "React-jsinspector"
   add_dependency(s, "React-jsitooling", :framework_name => "JSITooling")
+
+  mark_as_react_native_build(s)
 end
diff --git a/packages/react-native/ReactCommon/react/runtime/React-RuntimeHermes.podspec b/packages/react-native/ReactCommon/react/runtime/React-RuntimeHermes.podspec
index ac7d4419db23..8a0cf34d7b33 100644
--- a/packages/react-native/ReactCommon/react/runtime/React-RuntimeHermes.podspec
+++ b/packages/react-native/ReactCommon/react/runtime/React-RuntimeHermes.podspec
@@ -50,4 +50,6 @@ Pod::Spec.new do |s|
 
   add_rn_third_party_dependencies(s)
   add_rncore_dependency(s)
+
+  mark_as_react_native_build(s)
 end
diff --git a/packages/react-native/ReactCommon/react/runtime/platform/ios/React-RuntimeApple.podspec b/packages/react-native/ReactCommon/react/runtime/platform/ios/React-RuntimeApple.podspec
index 7c84db0bca95..947cd5c69d19 100644
--- a/packages/react-native/ReactCommon/react/runtime/platform/ios/React-RuntimeApple.podspec
+++ b/packages/react-native/ReactCommon/react/runtime/platform/ios/React-RuntimeApple.podspec
@@ -69,4 +69,6 @@ Pod::Spec.new do |s|
 
   add_rn_third_party_dependencies(s)
   add_rncore_dependency(s)
+
+  mark_as_react_native_build(s)
 end
diff --git a/packages/react-native/ReactCommon/react/timing/React-timing.podspec b/packages/react-native/ReactCommon/react/timing/React-timing.podspec
index 246b27ee4f28..75f27c5e2411 100644
--- a/packages/react-native/ReactCommon/react/timing/React-timing.podspec
+++ b/packages/react-native/ReactCommon/react/timing/React-timing.podspec
@@ -42,4 +42,6 @@ Pod::Spec.new do |s|
   add_dependency(s, "React-debug")
 
   s.resource_bundles = {'React-timing_privacy' => 'PrivacyInfo.xcprivacy'}
+
+  mark_as_react_native_build(s)
 end
diff --git a/packages/react-native/ReactCommon/react/utils/React-utils.podspec b/packages/react-native/ReactCommon/react/utils/React-utils.podspec
index 1a939b49cb28..430fe08f0f37 100644
--- a/packages/react-native/ReactCommon/react/utils/React-utils.podspec
+++ b/packages/react-native/ReactCommon/react/utils/React-utils.podspec
@@ -54,4 +54,6 @@ Pod::Spec.new do |s|
   add_rncore_dependency(s)
 
   add_dependency(s, "React-debug")
+
+  mark_as_react_native_build(s)
 end
diff --git a/packages/react-native/ReactCommon/reactperflogger/React-perflogger.podspec b/packages/react-native/ReactCommon/reactperflogger/React-perflogger.podspec
index fb32c2a11eaa..53161afe73a8 100644
--- a/packages/react-native/ReactCommon/reactperflogger/React-perflogger.podspec
+++ b/packages/react-native/ReactCommon/reactperflogger/React-perflogger.podspec
@@ -39,4 +39,6 @@ Pod::Spec.new do |s|
 
   add_rn_third_party_dependencies(s)
   add_rncore_dependency(s)
+
+  mark_as_react_native_build(s)
 end
diff --git a/packages/react-native/ReactCommon/runtimeexecutor/React-runtimeexecutor.podspec b/packages/react-native/ReactCommon/runtimeexecutor/React-runtimeexecutor.podspec
index 155735ca9d8a..6ad619fadd7d 100644
--- a/packages/react-native/ReactCommon/runtimeexecutor/React-runtimeexecutor.podspec
+++ b/packages/react-native/ReactCommon/runtimeexecutor/React-runtimeexecutor.podspec
@@ -53,4 +53,5 @@ Pod::Spec.new do |s|
   add_dependency(s, "React-utils", :additional_framework_paths => ["react/utils/platform/ios"])
 
 
+  mark_as_react_native_build(s)
 end
diff --git a/packages/react-native/ReactCommon/yoga/Yoga.podspec b/packages/react-native/ReactCommon/yoga/Yoga.podspec
index ade85279bfaf..fda642ddcff4 100644
--- a/packages/react-native/ReactCommon/yoga/Yoga.podspec
+++ b/packages/react-native/ReactCommon/yoga/Yoga.podspec
@@ -63,4 +63,6 @@ Pod::Spec.new do |spec|
   all_header_files = File.join('ReactCommon/yoga', all_header_files) if ENV['INSTALL_YOGA_WITHOUT_PATH_OPTION']
   spec.private_header_files = Dir.glob(all_header_files).sort - Dir.glob(public_header_files).sort
   spec.preserve_paths = [all_header_files]
+
+  mark_as_react_native_build(spec)
 end
diff --git a/packages/react-native/scripts/cocoapods/__tests__/new_architecture-test.rb b/packages/react-native/scripts/cocoapods/__tests__/new_architecture-test.rb
index ba95cfc3331f..fc1fa036be4b 100644
--- a/packages/react-native/scripts/cocoapods/__tests__/new_architecture-test.rb
+++ b/packages/react-native/scripts/cocoapods/__tests__/new_architecture-test.rb
@@ -165,6 +165,7 @@ def test_installModulesDependencies_whenNewArchEnabledAndNewArchAndNoSearchPaths
                 { :dependency_name => "React-rendererdebug" },
                 { :dependency_name => "React-jsi" },
                 { :dependency_name => "React-renderercss" },
+                { :dependency_name => "React-cxxstableapi" },
                 { :dependency_name => "hermes-engine" },
                 { :dependency_name => "glog" },
                 { :dependency_name => "boost" },
@@ -216,6 +217,7 @@ def test_installModulesDependencies_whenNewArchDisabledAndSearchPathsAndCompiler
                 { :dependency_name => "React-rendererdebug" },
                 { :dependency_name => "React-jsi" },
                 { :dependency_name => "React-renderercss" },
+                { :dependency_name => "React-cxxstableapi" },
                 { :dependency_name => "hermes-engine" },
                 { :dependency_name => "glog" },
                 { :dependency_name => "boost" },
diff --git a/packages/react-native/scripts/cocoapods/__tests__/utils-test.rb b/packages/react-native/scripts/cocoapods/__tests__/utils-test.rb
index 844a4e941443..a5dd5c99df44 100644
--- a/packages/react-native/scripts/cocoapods/__tests__/utils-test.rb
+++ b/packages/react-native/scripts/cocoapods/__tests__/utils-test.rb
@@ -632,7 +632,7 @@ def test_updateSearchPaths_whenUseFrameworks_addsSearchPaths
         # Assert
         user_project_mock.build_configurations.each do |config|
             received_search_path = config.build_settings["HEADER_SEARCH_PATHS"]
-            expected_search_path = "$(inherited) ${PODS_CONFIGURATION_BUILD_DIR}/ReactCommon/ReactCommon.framework/Headers ${PODS_CONFIGURATION_BUILD_DIR}/ReactCommon/ReactCommon.framework/Headers/react/nativemodule/core ${PODS_CONFIGURATION_BUILD_DIR}/React-runtimeexecutor/React_runtimeexecutor.framework/Headers ${PODS_CONFIGURATION_BUILD_DIR}/React-runtimeexecutor/React_runtimeexecutor.framework/Headers/platform/ios ${PODS_CONFIGURATION_BUILD_DIR}/ReactCommon-Samples/ReactCommon_Samples.framework/Headers ${PODS_CONFIGURATION_BUILD_DIR}/ReactCommon-Samples/ReactCommon_Samples.framework/Headers/platform/ios ${PODS_CONFIGURATION_BUILD_DIR}/React-Fabric/React_Fabric.framework/Headers/react/renderer/components/view/platform/cxx ${PODS_CONFIGURATION_BUILD_DIR}/React-NativeModulesApple/React_NativeModulesApple.framework/Headers ${PODS_CONFIGURATION_BUILD_DIR}/React-graphics/React_graphics.framework/Headers ${PODS_CONFIGURATION_BUILD_DIR}/React-graphics/React_graphics.framework/Headers/react/renderer/graphics/platform/ios ${PODS_CONFIGURATION_BUILD_DIR}/React-featureflags/React_featureflags.framework/Headers ${PODS_CONFIGURATION_BUILD_DIR}/React-renderercss/React_renderercss.framework/Headers"
+            expected_search_path = "$(inherited) ${PODS_CONFIGURATION_BUILD_DIR}/ReactCommon/ReactCommon.framework/Headers ${PODS_CONFIGURATION_BUILD_DIR}/ReactCommon/ReactCommon.framework/Headers/react/nativemodule/core ${PODS_CONFIGURATION_BUILD_DIR}/React-runtimeexecutor/React_runtimeexecutor.framework/Headers ${PODS_CONFIGURATION_BUILD_DIR}/React-runtimeexecutor/React_runtimeexecutor.framework/Headers/platform/ios ${PODS_CONFIGURATION_BUILD_DIR}/ReactCommon-Samples/ReactCommon_Samples.framework/Headers ${PODS_CONFIGURATION_BUILD_DIR}/ReactCommon-Samples/ReactCommon_Samples.framework/Headers/platform/ios ${PODS_CONFIGURATION_BUILD_DIR}/React-Fabric/React_Fabric.framework/Headers/react/renderer/components/view/platform/cxx ${PODS_CONFIGURATION_BUILD_DIR}/React-NativeModulesApple/React_NativeModulesApple.framework/Headers ${PODS_CONFIGURATION_BUILD_DIR}/React-graphics/React_graphics.framework/Headers ${PODS_CONFIGURATION_BUILD_DIR}/React-graphics/React_graphics.framework/Headers/react/renderer/graphics/platform/ios ${PODS_CONFIGURATION_BUILD_DIR}/React-featureflags/React_featureflags.framework/Headers ${PODS_CONFIGURATION_BUILD_DIR}/React-renderercss/React_renderercss.framework/Headers ${PODS_CONFIGURATION_BUILD_DIR}/React-cxxstableapi/React_cxxstableapi.framework/Headers"
             assert_equal(expected_search_path, received_search_path)
         end
 
@@ -812,6 +812,48 @@ def test_creatHeaderSearchPathForFrameworks_whenMultiplePlatformsAndExtraPath_cr
         ], result)
     end
 
+    # ================================= #
+    # TEST - Add RN_BUILDING definition #
+    # ================================= #
+    def test_addRNBuildingDefinition_whenNoDefinitions_addsThem
+        spec = SpecMock.new
+
+        ReactNativePodsUtils.add_rn_building_definition(spec)
+
+        assert_equal({"GCC_PREPROCESSOR_DEFINITIONS" => "$(inherited) RN_BUILDING=1"}, spec.to_hash["pod_target_xcconfig"])
+    end
+
+    def test_addRNBuildingDefinition_whenOtherDefinitions_addsThemPreservingTheOthers
+        spec = SpecMock.new
+        spec.pod_target_xcconfig["GCC_PREPROCESSOR_DEFINITIONS"] = "$(inherited) SOME_FLAG=1"
+        spec.pod_target_xcconfig["CLANG_CXX_LANGUAGE_STANDARD"] = "c++20"
+
+        ReactNativePodsUtils.add_rn_building_definition(spec)
+
+        assert_equal({
+            "GCC_PREPROCESSOR_DEFINITIONS" => "$(inherited) SOME_FLAG=1 RN_BUILDING=1",
+            "CLANG_CXX_LANGUAGE_STANDARD" => "c++20"
+        }, spec.to_hash["pod_target_xcconfig"])
+    end
+
+    def test_addRNBuildingDefinition_whenDefinitionsAreAnArray_joinsThem
+        spec = SpecMock.new
+        spec.pod_target_xcconfig["GCC_PREPROCESSOR_DEFINITIONS"] = ["$(inherited)", "SOME_FLAG=1"]
+
+        ReactNativePodsUtils.add_rn_building_definition(spec)
+
+        assert_equal({"GCC_PREPROCESSOR_DEFINITIONS" => "$(inherited) SOME_FLAG=1 RN_BUILDING=1"}, spec.to_hash["pod_target_xcconfig"])
+    end
+
+    def test_addRNBuildingDefinition_whenCalledTwice_addsItOnce
+        spec = SpecMock.new
+
+        ReactNativePodsUtils.add_rn_building_definition(spec)
+        ReactNativePodsUtils.add_rn_building_definition(spec)
+
+        assert_equal({"GCC_PREPROCESSOR_DEFINITIONS" => "$(inherited) RN_BUILDING=1"}, spec.to_hash["pod_target_xcconfig"])
+    end
+
     # ===================== #
     # TEST - Add Dependency #
     # ===================== #
diff --git a/packages/react-native/scripts/cocoapods/new_architecture.rb b/packages/react-native/scripts/cocoapods/new_architecture.rb
index e4353427a977..0052196a2065 100644
--- a/packages/react-native/scripts/cocoapods/new_architecture.rb
+++ b/packages/react-native/scripts/cocoapods/new_architecture.rb
@@ -96,6 +96,7 @@ def self.install_modules_dependencies(spec, new_arch_enabled, folly_version = He
                 .concat(ReactNativePodsUtils.create_header_search_path_for_frameworks("PODS_CONFIGURATION_BUILD_DIR", "React-ImageManager", "React_ImageManager", []))
                 .concat(ReactNativePodsUtils.create_header_search_path_for_frameworks("PODS_CONFIGURATION_BUILD_DIR", "React-rendererdebug", "React_rendererdebug", []))
                 .concat(ReactNativePodsUtils.create_header_search_path_for_frameworks("PODS_CONFIGURATION_BUILD_DIR", "React-renderercss", "React_renderercss", []))
+                .concat(ReactNativePodsUtils.create_header_search_path_for_frameworks("PODS_CONFIGURATION_BUILD_DIR", "React-cxxstableapi", "React_cxxstableapi", []))
                 .each { |search_path|
                     header_search_paths << "\"#{search_path}\""
                 }
@@ -132,6 +133,7 @@ def self.install_modules_dependencies(spec, new_arch_enabled, folly_version = He
         spec.dependency "React-rendererdebug"
         spec.dependency 'React-jsi'
         spec.dependency 'React-renderercss'
+        spec.dependency 'React-cxxstableapi'
 
         depend_on_js_engine(spec)
         add_rn_third_party_dependencies(spec)
diff --git a/packages/react-native/scripts/cocoapods/utils.rb b/packages/react-native/scripts/cocoapods/utils.rb
index 60dcde24f155..2293a665d2e0 100644
--- a/packages/react-native/scripts/cocoapods/utils.rb
+++ b/packages/react-native/scripts/cocoapods/utils.rb
@@ -97,6 +97,27 @@ def self.set_gcc_preprocessor_definition_for_debugger(installer)
         self.add_build_settings_to_pod(installer, "GCC_PREPROCESSOR_DEFINITIONS", "REACT_NATIVE_DEBUGGER_ENABLED_DEVONLY=1", "React-networking", :debug)
     end
 
+    # The react/cxxstableapi guards turn a direct include of a fine-grained React Native
+    # header into an error for consumers that opt into RN_STRICT_API. React Native's own
+    # sources are exempt via RN_BUILDING, so every first-party pod defines it. Third-party
+    # pods must never get it, or they would silently opt out of the guards.
+    #
+    # This merges into pod_target_xcconfig as it stands when called, so call it after the
+    # spec has set its own xcconfig — in practice, last in the spec block.
+    def self.add_rn_building_definition(spec)
+        current_config = spec.to_hash["pod_target_xcconfig"] || {}
+        definitions = current_config["GCC_PREPROCESSOR_DEFINITIONS"] || "$(inherited)"
+
+        if definitions.is_a?(Array)
+            definitions = definitions.join(" ")
+        end
+
+        return if definitions.include?("RN_BUILDING=1")
+
+        current_config["GCC_PREPROCESSOR_DEFINITIONS"] = "#{definitions.strip()} RN_BUILDING=1".strip()
+        spec.pod_target_xcconfig = current_config
+    end
+
     def self.turn_off_resource_bundle_react_core(installer)
         # this is needed for Xcode 14, see more details here https://github.com/facebook/react-native/issues/34673
         # we should be able to remove this once CocoaPods catches up to it, see more details here https://github.com/CocoaPods/CocoaPods/issues/11402
@@ -362,6 +383,7 @@ def self.update_search_paths(installer)
                     .concat(ReactNativePodsUtils.create_header_search_path_for_frameworks("PODS_CONFIGURATION_BUILD_DIR", "React-graphics", "React_graphics", ["react/renderer/graphics/platform/ios"]))
                     .concat(ReactNativePodsUtils.create_header_search_path_for_frameworks("PODS_CONFIGURATION_BUILD_DIR", "React-featureflags", "React_featureflags", []))
                     .concat(ReactNativePodsUtils.create_header_search_path_for_frameworks("PODS_CONFIGURATION_BUILD_DIR", "React-renderercss", "React_renderercss", []))
+                    .concat(ReactNativePodsUtils.create_header_search_path_for_frameworks("PODS_CONFIGURATION_BUILD_DIR", "React-cxxstableapi", "React_cxxstableapi", []))
                     .each{ |search_path|
                         header_search_paths = self.add_search_path_if_not_included(header_search_paths, search_path)
                     }
diff --git a/packages/react-native/scripts/react_native_pods.rb b/packages/react-native/scripts/react_native_pods.rb
index 3b6d3142b38e..50cd3684c2e4 100644
--- a/packages/react-native/scripts/react_native_pods.rb
+++ b/packages/react-native/scripts/react_native_pods.rb
@@ -308,6 +308,20 @@ def resolve_use_frameworks(spec, header_mappings_dir: nil, module_name: nil)
   ReactNativePodsUtils.resolve_use_frameworks(spec, :header_mappings_dir => header_mappings_dir, :module_name => module_name)
 end
 
+# Mark a spec as part of React Native's own build by defining RN_BUILDING for it. The
+# react/cxxstableapi guards use it to stay inert for React Native's internal sources,
+# which keep including the fine-grained headers the guards fence off from consumers.
+# Only first-party React Native pods may call this.
+#
+# Call it last in the spec block: it merges into GCC_PREPROCESSOR_DEFINITIONS as
+# pod_target_xcconfig stands at call time, so a later assignment would drop it.
+#
+# Parameters:
+# - spec: the spec to modify
+def mark_as_react_native_build(spec)
+  ReactNativePodsUtils.add_rn_building_definition(spec)
+end
+
 # Add a dependency to a spec, making sure that the HEADER_SERACH_PATHS are set properly.
 # This function automate the requirement to specify the HEADER_SEARCH_PATHS which was error prone
 # and hard to pull out properly to begin with.