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Co-authored-by: Frederik Hennig <frederik.hennig@fau.de>

standalone/CMakeLists.txt

 cmake_minimum_required( VERSION 3.24 )
 project(PystencilsSfg_Standalone)
 
-set(CODEGEN_PRIVATE_VENV ON
-    CACHE BOOL
-    "Create a private virtual Python environment inside the build tree for code generation"
-)
 if (DEFINED CACHE{PystencilsSfg_PYTHON_INTERPRETER})
-	set( CACHE{CODEGEN_PRIVATE_VENV} OFF)
+    set( _use_venv_init OFF)
 elseif(DEFINED PystencilsSfg_PYTHON_PATH)
-	set( CACHE{CODEGEN_PRIVATE_VENV} OFF)
+    set( _use_venv_init OFF)
+else()
+    set( _use_venv_init ON )
 endif()
 
+set(CODEGEN_PRIVATE_VENV ${_use_venv_init}
+    CACHE BOOL
+    "Create a private virtual Python environment inside the build tree for code generation"
+)
+
 function(codegen_venv_install)
     if(NOT CODEGEN_PRIVATE_VENV)
         return()