/bin/zcat-reference and /bin/gunzip-reference are shell scripts. They call exec gzip. This is a problem if gzip's symlinked to pigz, because it's expected that reference means app-arch/gzip not app-arch/pigz. Reproducible: Always Steps to Reproduce: 1. Have app-arch/gzip installed and app-alternatives/gzip[pigz] set. 2.try to zcat some crap pigz can't handle like some old abandonware cat share/lotus/123.v10/sysV386/lib/123.o.z_1 share/lotus/123.v10/sysV386/lib/123.o.z_2 | zcat > test.o zcat: skipping: <stdin> unrecognized format Actual Results: zcat-reference -V pigz 2.7 Expected Results: reference implementations point to reference gzip, not pigz. I'd patch this myself but I think it has to be done early in case users have a weird system not installing to /bin.
See https://gitweb.gentoo.org/repo/gentoo.git/commit/app-arch/gzip?id=75180a96ea6c34e3f37b5c623ceeae66119d5bd7