CRUX

See  FS#1644  first.
compress_manpages() is called when:
gpg.1 exists
gpg.1.gz symlink to non-existing gpg.2.gz

The first loop from that function tries to compress all .N manuals to .N.gz. In this case, it fails with the following message:

gzip: ./usr/share/man/man1/gpg.1.gz already exists; not overwritten

The second loop, which tries to rename X.N -> Y.N functions to X.N.gz -> Y.N.gz, ignores this case because the target (gpg.2.gz) is missing.

Ignoring the gzip error code from the first loop in this case is harmless, apart from prtcheckmissing showing /usr/share/man/man1/gpg.1.gz as missing, but I wonder if we should exit on such errors (it might break other builds).