Fedora & RHEL ship openchange (dormant upstream) that relies on having a system pidl compiler available, thus we propose to revert e24e344d0da58013fd5fa404529fe1d25ef403bf See also: https://bugzilla.redhat.com/show_bug.cgi?id=1746014
Instead of re-adding the pidl install patch, we (Red Hat and Fedora) now install pidl as recommended via the perl MakeMaker makefile.
Thanks for working to find a way forward here!