diff --git a/.github/scripts/windows_pre_build.ps1 b/.github/scripts/prebuild.ps1
similarity index 100%
rename from .github/scripts/windows_pre_build.ps1
rename to .github/scripts/prebuild.ps1
diff --git a/.github/scripts/linux_pre_build.sh b/.github/scripts/prebuild.sh
similarity index 61%
rename from .github/scripts/linux_pre_build.sh
rename to .github/scripts/prebuild.sh
index fcbf2099..1cd6d3cd 100755
--- a/.github/scripts/linux_pre_build.sh
+++ b/.github/scripts/prebuild.sh
@@ -13,7 +13,26 @@
 
 set -e
 
-if command -v apt-get >/dev/null 2>&1 ; then # bookworm, noble, jammy
+if [[ $(uname) == Darwin ]] ; then
+    if [[ "$INSTALL_CMAKE" == "1" ]] ; then
+        mkdir -p "$RUNNER_TOOL_CACHE"
+        if ! command -v cmake >/dev/null 2>&1 ; then
+            curl -fsSLO https://github.com/Kitware/CMake/releases/download/v4.1.2/cmake-4.1.2-macos-universal.tar.gz
+            echo '3be85f5b999e327b1ac7d804cbc9acd767059e9f603c42ec2765f6ab68fbd367 cmake-4.1.2-macos-universal.tar.gz' > cmake-4.1.2-macos-universal.tar.gz.sha256
+            sha256sum -c cmake-4.1.2-macos-universal.tar.gz.sha256
+            tar -xf cmake-4.1.2-macos-universal.tar.gz
+            ln -s "$PWD/cmake-4.1.2-macos-universal/CMake.app/Contents/bin/cmake" "$RUNNER_TOOL_CACHE/cmake"
+        fi
+        if ! command -v ninja >/dev/null 2>&1 ; then
+            curl -fsSLO https://github.com/ninja-build/ninja/releases/download/v1.13.1/ninja-mac.zip
+            echo 'da7797794153629aca5570ef7c813342d0be214ba84632af886856e8f0063dd9 ninja-mac.zip' > ninja-mac.zip.sha256
+            sha256sum -c ninja-mac.zip.sha256
+            unzip ninja-mac.zip
+            rm -f ninja-mac.zip
+            mv ninja "$RUNNER_TOOL_CACHE/ninja"
+        fi
+    fi
+elif command -v apt-get >/dev/null 2>&1 ; then # bookworm, noble, jammy
     export DEBIAN_FRONTEND=noninteractive
 
     apt-get update -y
diff --git a/.github/workflows/pull_request.yml b/.github/workflows/pull_request.yml
index 6bbd2ac5..985ee238 100644
--- a/.github/workflows/pull_request.yml
+++ b/.github/workflows/pull_request.yml
@@ -14,16 +14,17 @@ jobs:
     uses: swiftlang/github-workflows/.github/workflows/swift_package_test.yml@main
     with:
       linux_os_versions: '["amazonlinux2", "bookworm", "noble", "jammy", "rhel-ubi9"]'
-      linux_pre_build_command: ./.github/scripts/linux_pre_build.sh
+      linux_pre_build_command: ./.github/scripts/prebuild.sh
       linux_build_command: 'swift test --no-parallel'
       linux_swift_versions: '["nightly-main", "nightly-6.2"]'
-      windows_pre_build_command: 'Invoke-Program .\.github\scripts\windows_pre_build.ps1'
+      windows_pre_build_command: 'Invoke-Program .\.github\scripts\prebuild.ps1'
       windows_swift_versions: '["nightly-main"]'
       windows_build_command: 'Invoke-Program swift test --no-parallel'
       enable_linux_static_sdk_build: true
       linux_static_sdk_build_command: SWIFTBUILD_STATIC_LINK=1 LLBUILD_STATIC_LINK=1 swift build
       enable_macos_checks: true
       macos_exclude_xcode_versions: "[{\"xcode_version\": \"16.3\"}, {\"xcode_version\": \"16.4\"}]"
+      macos_pre_build_command: ./.github/scripts/prebuild.sh
       macos_build_command:
         swift test &&
         /usr/bin/xcrun xcodebuild -workspace . -scheme SwiftBuild-Package -destination generic/platform=iOS
@@ -32,10 +33,14 @@ jobs:
     uses: swiftlang/github-workflows/.github/workflows/swift_package_test.yml@main
     with:
       linux_os_versions: '["noble"]'
-      linux_pre_build_command: SKIP_ANDROID=1 INSTALL_CMAKE=1 ./.github/scripts/linux_pre_build.sh
+      linux_pre_build_command: SKIP_ANDROID=1 INSTALL_CMAKE=1 ./.github/scripts/prebuild.sh
       linux_build_command: 'swift package -Xbuild-tools-swiftc -DUSE_PROCESS_SPAWNING_WORKAROUND cmake-smoke-test --disable-sandbox --cmake-path `which cmake` --ninja-path `which ninja` --extra-cmake-arg -DCMAKE_C_COMPILER=`which clang` --extra-cmake-arg -DCMAKE_CXX_COMPILER=`which clang++` --extra-cmake-arg -DCMAKE_Swift_COMPILER=`which swiftc`'
       linux_swift_versions: '["nightly-main"]'
-      windows_pre_build_command: 'Invoke-Program .\.github\scripts\windows_pre_build.ps1 -SkipAndroid -InstallCMake'
+      enable_macos_checks: true
+      macos_xcode_versions: '["26.0"]'
+      macos_pre_build_command: SKIP_ANDROID=1 INSTALL_CMAKE=1 ./.github/scripts/prebuild.sh
+      macos_build_command: 'export PATH=$PATH:$RUNNER_TOOL_CACHE && swift package cmake-smoke-test --disable-sandbox --cmake-path `which cmake` --ninja-path `which ninja` --extra-cmake-arg -DCMAKE_C_COMPILER=`which clang` --extra-cmake-arg -DCMAKE_CXX_COMPILER=`which clang++` --extra-cmake-arg -DCMAKE_Swift_COMPILER=`which swiftc`'
+      windows_pre_build_command: 'Invoke-Program .\.github\scripts\prebuild.ps1 -SkipAndroid -InstallCMake'
       windows_swift_versions: '["nightly-main"]'
       windows_build_command: 'Invoke-Program swift package cmake-smoke-test --disable-sandbox --cmake-path (Get-Command cmake).Path --ninja-path (Get-Command ninja).Path --extra-cmake-arg "-DCMAKE_C_COMPILER=$((Get-Command clang).Path)" --extra-cmake-arg "-DCMAKE_CXX_COMPILER=$((Get-Command clang).Path)" --extra-cmake-arg "-DCMAKE_Swift_COMPILER=$((Get-Command swiftc).Path)" --extra-cmake-arg "-DCMAKE_STATIC_LIBRARY_PREFIX_Swift=lib" --extra-cmake-arg "-DCMAKE_MSVC_RUNTIME_LIBRARY=MultiThreadedDLL"'