Automatic sorting of environment variables in kit breaks parsing

In a kit configuration we can specify environment variables and I currently specify

PREFIX=/home/mleoni/opt/FEniCS-X/install
PATH=${PREFIX}/local/bin:${PATH}

This works immediately after I press "Apply", but as soon as I go back into the dialog window the entries get sorted and if I then "Apply" again I get that PREFIX is defined after PATH and so the latter can't see the former, which breaks my build environment.