Hi, the problem is line
> m4_define_default([am_py_min_ver], m4_ifval([$1], [$1], [2.0])) Code like > AM_PATH_PYTHON([$PYTHON_VERSION]) will result in "am_py_min_ver" set to "$PYTHON_VERSION" which is obviously not a valid value. I.e. the passed argument isn't expanded when used in the macro. However, I don't understand why we need the dynamic in the list creation. From my understanding, GNU Pyconfigure, the implementation source, provided a macro which requires to set lower and upper bound ("PC_INIT([MIN_VER], [MAX_VER])"). But given that the AM_PATH_PYTHON public function wasn't changed, we don't need to (better: cannot) generate the list dynamically. So I would recommend to change this line to > m4_define_default([am_py_min_ver], [2.0]) This fixes the problem in cryptsetup, util-linux and PythonMagick for me. And the check still works. I.e. when I remove the minimum Python version or newer on my system, configure fails like expected. -- Regards, Thomas Deutschmann / Gentoo Linux Developer C4DD 695F A713 8F24 2AA1 5638 5849 7EE5 1D5D 74A5