Fix CI

Author: jimporter

Diff for: .github/workflows/build.yml

@@ -58,7 +58,8 @@ jobs:
              boost-version: '1.80.0'}
 
           # macOS builds
-          - {os: macos-latest, compiler: clang}
+          # FIXME: Remove -Wno-deprecated flag.
+          - {os: macos-latest, compiler: clang, flags: '-Wno-deprecated'}
 
           # C++20 builds
           - {os: ubuntu-latest, compiler: gcc, version: '13',
@@ -110,7 +111,9 @@ jobs:
       - name: Install macOS dependencies
         if: startsWith(matrix.os, 'macos-')
         run: |
-          brew install ninja pkg-config boost
+          brew install boost ninja pkg-config
+          echo "CPATH=/opt/homebrew/include" >> ${GITHUB_ENV}
+          echo "LIBRARY_PATH=/opt/homebrew/lib" >> ${GITHUB_ENV}
       - name: Install Boost ${{ matrix.boost-version }} from source
         if: "!startsWith(matrix.os, 'windows-') && matrix.boost-version"
         run: |
@@ -172,7 +175,7 @@ jobs:
           ninja install
           popd
           echo "PATH=${HOME}/bin:${PATH}" >> ${GITHUB_ENV}
-          echo "CPATH=${HOME}/include" >> ${GITHUB_ENV}
+          echo "CPATH=${HOME}/include:${CPATH}" >> ${GITHUB_ENV}
           echo "PKG_CONFIG_PATH=${HOME}/lib/pkgconfig" >> ${GITHUB_ENV}
           echo "CXXFLAGS=${COMMONFLAGS} ${{ matrix.flags }}" >> ${GITHUB_ENV}
       - name: Build mettle (Windows)

Diff for: build.bfg

@@ -12,6 +12,7 @@ install(includes)
 test_files = find_paths('test/**/*.cpp')
 
 try:
+    boost = package('boost')
     libmettle = package('mettle')
     mettle = test_driver(['mettle', '--output=verbose'])
 
@@ -20,7 +21,7 @@ try:
             src.stripext().suffix,
             files=src,
             includes=includes,
-            packages=[libmettle]
+            packages=[boost, libmettle]
         ), driver=mettle)
 except PackageResolutionError:
     warning('mettle not found; tests disabled')