Added MacOS CI tests

.github/workflows/build_macos.yml

@@ -0,0 +1,39 @@
+# Build from source.
+name: build_macos
+on: [push, pull_request]
+permissions: read-all
+jobs:
+  build_ubuntu:
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        include:
+        - os: macos-11
+          configure_options: ''
+        - os: macos-12
+          configure_options: ''
+        - os: macos-13
+          configure_options: ''
+        - os: macos-14
+          configure_options: ''
+        - os: macos-15
+          configure_options: ''
+    steps:
+    - uses: actions/checkout@v4
+    - name: Install build dependencies
+      run: |
+        brew update -q
+        brew install -q autoconf automake gettext gnu-sed libtool pkg-config || true
+        brew link --force gettext
+        ln -s /usr/local/bin/glibtoolize /usr/local/bin/libtoolize
+    - name: Download test data
+      run: |
+        if test -x "synctestdata.sh"; then ./synctestdata.sh; fi
+    - name: Building from source
+      env:
+        CC: ${{ matrix.compiler }}
+      run: |
+        tests/build.sh ${{ matrix.configure_options }}
+    - name: Run tests
+      run: |
+        tests/runtests.sh