Hi there, this is a bug that affects grep 2.28 and several preceding versions: The po/Makefile.in.in is using $top_builddir, but the variable is never set. Fixing this is of course trivial, one just needs to insert
top_builddir = @top_builddir@ in the appropriate place. However, this file is not present in the grep repository, so I am guessing it is generated by something (gettext?). As I have no idea how this all works, I am afraid I cannot supply a proper patch, but I hope the issue is clear, and that you will know how to resolve it. Cheers, Max
