So that it will use the /Users/john/Development/Gramps-Build/gramps-51-tarball-10.12-x86_64/inst/bin:/Users/john/.local/share/virtualenvs/etc-vauAPygS/bin:/Users/john/.local/share/pyenv/shims:/Users/john/.local/bin:/usr/local/bin:/bin:/usr/bin:/sbin:/usr/sbin at runtime instead of at config time.