Disable Qt 6; try to reenable Xcode.

.github/workflows/build.yml

@@ -1,18 +1,20 @@
 name: Build
 on: [pull_request]
 jobs:
-#  build-mac-xcodebuild:
-#    name: Mac UI / xcodebuild / ${{ matrix.os }}
-#    strategy:
-#      matrix:
-#        os: [macos-13, macos-14, macos-15]
-#    runs-on: ${{ matrix.os }}
-#    steps:
-#    - name: Checkout
-#      uses: actions/checkout@v4
-#    - name: Make
-#      working-directory: OSBindings/Mac
-#      run: xcodebuild CODE_SIGN_IDENTITY=-
+
+  build-mac-xcodebuild:
+    name: Mac UI / xcodebuild / ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [macos-13, macos-14, macos-15]
+    runs-on: ${{ matrix.os }}
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v4
+    - name: Make
+      working-directory: OSBindings/Mac
+      run: xcodebuild
+
   build-sdl-cmake:
     name: SDL UI / cmake / ${{ matrix.os }}
     strategy:
@@ -49,6 +51,7 @@ jobs:
         esac
         cmake -S. -Bbuild -DCLK_UI=SDL -DCMAKE_BUILD_TYPE=Release
         cmake --build build -v -j"$jobs"
+
   build-sdl-scons:
     name: SDL UI / scons / ${{ matrix.os }}
     strategy:
@@ -85,6 +88,7 @@ jobs:
             jobs=1
         esac
         scons -j"$jobs"
+
   build-qt5:
     name: Qt 5 / ${{ matrix.os }}
     strategy:
@@ -105,23 +109,24 @@ jobs:
       run: |
         qmake -o Makefile clksignal.pro
         make
-  build-qt6:
-    name: Qt 6 / ${{ matrix.os }}
-    strategy:
-      matrix:
-        os: [ubuntu-latest]
-    runs-on: ${{ matrix.os }}
-    steps:
-    - name: Checkout
-      uses: actions/checkout@v4
-    - name: Install dependencies
-      uses: jurplel/install-qt-action@v4
-      with:
-        version: '6.8'
-        archives: qtbase
-    - name: Make
-      working-directory: OSBindings/Qt
-      shell: bash
-      run: |
-        qmake -o Makefile clksignal.pro
-        make
+
+#  build-qt6:
+#    name: Qt 6 / ${{ matrix.os }}
+#    strategy:
+#      matrix:
+#        os: [ubuntu-latest]
+#    runs-on: ${{ matrix.os }}
+#    steps:
+#    - name: Checkout
+#      uses: actions/checkout@v4
+#    - name: Install dependencies
+#      uses: jurplel/install-qt-action@v4
+#      with:
+#        version: '6.8'
+#        archives: qtbase
+#    - name: Make
+#      working-directory: OSBindings/Qt
+#      shell: bash
+#      run: |
+#        qmake -o Makefile clksignal.pro
+#        make