This appears to be an upstream packaging error (cf. https://bugzilla.redhat.com/show_bug.cgi?id=836795). Upgrading to netpbm-10.58.03 fixes this. Reproducible: Always
should be all set now in the tree; thanks for the report! Commit message: Version bump http://sources.gentoo.org/media-libs/netpbm/netpbm-10.59.00.ebuild?rev=1.1