ecompress and ecompressdir shouldn't be used in ebuilds. See tracker bug 218347.
Fixed in new gerbv-2.5.0 +*gerbv-2.5.0 (26 Feb 2011) + + 26 Feb 2011; Thomas Beierlein <tomjbe@gentoo.org> + -files/gerbv-1.0.0-Xinerama.patch, -files/gerbv-1.0.0-gcc-4.10.patch, + -gerbv-1.0.1-r1.ebuild, -gerbv-2.1.0.ebuild, +gerbv-2.5.0.ebuild: + Version bump. Drop use of 'ecompress' (bug 356505), thanks ulm. Cleanup old + versions +