The gen directory is for things that are created by make and it
is deleted by make clean. But pkgconfig.h.in is not generated by
make. So it does not belong into src but rather into gen.
Unfortunately GAP's BuildPackages.sh script runs make clean before
make, which triggered this bug.
The
gendirectory is for things that are created bymakeand it is deleted bymake clean. Butpkgconfig.h.inis not generated bymake. So it does not belong intosrcbut rather intogen.Unfortunately GAP's
BuildPackages.shscript runsmake cleanbeforemake, which triggered this bug.