Description of problem:
brp-compress runs gunzip without -f ; in some cases, this causes rpmbuild to hang,
waiting for the user eg.
gunzip: ./usr/share/info/R-intro.info already exists; do you wish to overwrite
(y or n)? y
Version-Release number of selected component (if applicable):
Yup, but there's no easy and reliable fix here except
to remove precompressed manpages in the %install scriptlet,
there's too many versions of brp-compress already released.
I'm not suggesting that there is a real fix, but I merely that it should fail
with some error message, in stead of user interaction -- if user interaction is
acceptable, then -f is, too, and for a batch program like rpmbuild, -f is more
appropriate than a prompt.