Scott, Sometimes when I run the below test the harness mis-behaves. I cannot say what is different when this happens and doesn't because sometimes it also works. Thanks Barry make -f gmakefile.test test query='requires' queryval='kokkos' Traceback (most recent call last): File "config/query_tests.py", line 226, in <module> main() File "config/query_tests.py", line 187, in main petsc_full_arch = os.path.join(petsc_dir, petsc_arch) File "/usr/lib64/python3.7/posixpath.py", line 94, in join genericpath._check_arg_types('join', a, *p) File "/usr/lib64/python3.7/genericpath.py", line 153, in _check_arg_types (funcname, s.__class__.__name__)) from None TypeError: join() argument must be str or bytes, not 'NoneType' Using MAKEFLAGS: -- queryval=kokkos query=requires # No tests run # No tests run # No tests run