We need python3 to be the default for building.

pkg/mac/README

@@ -9,6 +9,9 @@ similar):
 2. PostgreSQL installation
   - PostgreSQL 12 or above from http://www.postgresql.org/
 
+3. Python 3.5+ (required for building). The build environment should run this 
+  version of python in response to the "python" command.
+  
 Building:
 
 1. To bundle a different version of Python from the default of 3.9.0, set the

pkg/mac/build-functions.sh

@@ -44,7 +44,7 @@ _create_python_env() {
     LD_LIBRARY_PATH=${PGADMIN_POSTGRES_DIR}/lib:${LD_LIBRARY_PATH}
 
     git clone https://github.com/gregneagle/relocatable-python.git "${BUILD_ROOT}/relocatable_python"
-    PATH=$PATH:/usr/local/pgsql/bin python3 "${BUILD_ROOT}/relocatable_python/make_relocatable_python_framework.py" --upgrade-pip --python-version ${PGADMIN_PYTHON_VERSION} --pip-requirements "${SOURCE_DIR}/requirements.txt" --destination "${BUNDLE_DIR}/Contents/Frameworks/"
+    PATH=$PATH:/usr/local/pgsql/bin python "${BUILD_ROOT}/relocatable_python/make_relocatable_python_framework.py" --upgrade-pip --python-version ${PGADMIN_PYTHON_VERSION} --pip-requirements "${SOURCE_DIR}/requirements.txt" --destination "${BUNDLE_DIR}/Contents/Frameworks/"
 
     # Remove some things we don't need
     cd "${BUNDLE_DIR}/Contents/Frameworks/Python.framework"