cmake_minimum_required(VERSION 3.1) project(TestPython3Fail C) include(CTest) find_package(Python3 REQUIRED COMPONENTS Interpreter Development foobar) Python3_add_library (spam3 MODULE ../spam.c) target_compile_definitions (spam3 PRIVATE PYTHON3) add_test (NAME python3_spam3 COMMAND "${CMAKE_COMMAND}" -E env "PYTHONPATH=$" "${Python3_EXECUTABLE}" -c "import spam3; spam3.system(\"cd\")")