diff --git a/.github/workflows/presubmit.yml b/.github/workflows/presubmit.yml
index f7e5d5f..fb898fb 100644
--- a/.github/workflows/presubmit.yml
+++ b/.github/workflows/presubmit.yml
@@ -22,6 +22,7 @@ jobs:
         --binary clang-format
 
   linux:
+    if: false
     runs-on: ubuntu-latest
     needs: format
     defaults:
@@ -300,6 +301,7 @@ jobs:
         fi; 
 
   windows:
+    if: false
     runs-on: windows-latest
     needs: format
     defaults:
@@ -375,7 +377,10 @@ jobs:
 
     - name: Install dependencies (vcpkg)
       if: matrix.DEPS == 'vcpkg' && steps.vcpkg-install.outputs.cache-hit != 'true'
-      run: C:\vcpkg\vcpkg.exe install boost-wave:${{matrix.BIN}}-windows-static-md
+      run: |
+        cd ${env:VCPKG_INSTALLATION_ROOT}
+        git pull
+        .\vcpkg.exe install boost-wave:${{matrix.BIN}}-windows-static-md
 
     - name: Cache Ninja install
       id: ninja-install
@@ -730,14 +735,14 @@ jobs:
         COMPILER:
         - CC: /usr/bin/clang
           CXX: /usr/bin/clang++
-        - CC: gcc-11
-          CXX: g++-11
-        - CC: gcc-13
-          CXX: g++-13
+        # - CC: gcc-11
+        #   CXX: g++-11
+        # - CC: gcc-13
+        #   CXX: g++-13
         GEN:
         - Xcode
-        - Ninja Multi-Config
-        DEPS: [system, vcpkg, fetch]
+        # - Ninja Multi-Config
+        DEPS: [vcpkg] # [system, vcpkg, fetch]
         exclude:
         # These entries are excluded, since XCode selects its own compiler
         - COMPILER:
@@ -761,6 +766,7 @@ jobs:
     env:
       CC: ${{matrix.COMPILER.CC}}
       CXX: ${{matrix.COMPILER.CXX}}
+      VCPKG_INSTALLATION_ROOT: ${{github.workspace}}/../vcpkg
     steps:
     - name: Create Build Environment
       run: |
@@ -769,6 +775,7 @@ jobs:
         if [[ "${{matrix.DEPS}}" == "vcpkg" && ! `which pkg-config` ]]; then brew install pkg-config; fi;
         # We need to provide an OpenCL driver for Intel CPU on mac
         brew install pocl
+        ls -lah /opt/homebrew/Cellar/pocl/5.0/etc/OpenCL/vendors
         cmake --version
 
     - name: Install dependencies (Homebrew)
@@ -780,7 +787,7 @@ jobs:
       id: vcpkg-install
       uses: actions/cache@v4
       with:
-        path: /usr/local/share/vcpkg
+        path: ${{env.VCPKG_INSTALLATION_ROOT}}
         key: vcpkg-macos-${{matrix.COMPILER.CXX}}
 
     - name: Install dependencies (vcpkg)
@@ -788,6 +795,8 @@ jobs:
       # Important: the same compiler must be used with vcpkg as with the project build
       # because apple-clang uses a different standard library implementation from GCC
       run: |
+        git clone https://github.com/Microsoft/vcpkg.git $VCPKG_INSTALLATION_ROOT
+        $VCPKG_INSTALLATION_ROOT/bootstrap-vcpkg.sh
         $VCPKG_INSTALLATION_ROOT/vcpkg install boost-wave gtest rapidxml
 
     - name: Set up compiler flags
@@ -891,7 +900,7 @@ jobs:
         then
           export LABEL_EXCLUDE=system-icd;
         fi
-        export OCL_ICD_VENDORS=/usr/local/etc/OpenCL/vendors
+        export OCL_ICD_VENDORS=/opt/homebrew/Cellar/pocl/5.0/etc/OpenCL/vendors
         ctest --test-dir $GITHUB_WORKSPACE/build --output-on-failure --no-tests=error -C Debug   --parallel `sysctl -n hw.logicalcpu` --label-exclude $LABEL_EXCLUDE
         ctest --test-dir $GITHUB_WORKSPACE/build --output-on-failure --no-tests=error -C Release --parallel `sysctl -n hw.logicalcpu` --label-exclude $LABEL_EXCLUDE
 
@@ -915,11 +924,12 @@ jobs:
       # For an unknown reason, there are test failures when compiled with g++ in the GitHub shared runner, and pocl is used.
       if: matrix.COMPILER.CC == '/usr/bin/clang'
       run: |
-        export OCL_ICD_VENDORS=/usr/local/etc/OpenCL/vendors
+        export OCL_ICD_VENDORS=/opt/homebrew/Cellar/pocl/5.0/etc/OpenCL/vendors
         ctest --output-on-failure --no-tests=error --test-dir $GITHUB_WORKSPACE/program-cache/lib/test/package/build -C Debug --parallel `sysctl -n hw.logicalcpu`
         ctest --output-on-failure --no-tests=error --test-dir $GITHUB_WORKSPACE/program-cache/lib/test/package/build -C Release --parallel `sysctl -n hw.logicalcpu`
 
   android:
+    if: false
     runs-on: ubuntu-latest
     needs: format
     defaults: