Try DPYTHON_EXECUTABLE

.github/workflows/mac.yml

@@ -35,7 +35,7 @@ jobs:
         run: |
           source .venv/bin/activate
           mkdir build && cd build
-          cmake .. -DCMAKE_VERBOSE_MAKEFILE=ON -DENABLE_QT6=ON -DCMAKE_BUILD_TYPE=Release -DDEBUG_OUTPUT=ON -DENABLE_CHANNELRX_DEMODDATV=OFF -DENABLE_CHANNELTX_MODDATV=OFF -DENABLE_MIRISDR=OFF -DBUILD_SERVER=OFF -DENABLE_EXTERNAL_LIBRARIES=ON -DBUNDLE=ON -DPKG_CONFIG_USE_CMAKE_PREFIX_PATH=TRUE
+          cmake .. -DCMAKE_VERBOSE_MAKEFILE=ON -DENABLE_QT6=ON -DCMAKE_BUILD_TYPE=Release -DDEBUG_OUTPUT=ON -DENABLE_CHANNELRX_DEMODDATV=OFF -DENABLE_CHANNELTX_MODDATV=OFF -DENABLE_MIRISDR=OFF -DBUILD_SERVER=OFF -DENABLE_EXTERNAL_LIBRARIES=ON -DBUNDLE=ON -DPKG_CONFIG_USE_CMAKE_PREFIX_PATH=TRUE -DPYTHON_EXECUTABLE=`pwd`/.venv/bin/python3
       - name: Build SDRangel on Mac
         run: |
           source .venv/bin/activate