OK, here's a patch to add --with-python_prefix and --with-python_exec_prefix options. It applies on top of my previous patch.
Thanks! I think the option names would be normal with all hyphens (e.g., the std option is --exec-prefix, not --exec_prefix), but I'll just tweak that when I install, obviously trivial. setting a custom PYTHON_PREFIX but wanting to keep the automatically determined value of PYTHON_EXEC_PREFIX seems like it would be a pretty rare scenario. Fully agreed. Thanks again. -k