Gentoo's Bugzilla –
Attachment 163969 Details for
Bug 235786net-misc/openssh-4.7_p1-r6 and net-misc/openssh-5.1_p1-r1 does not compile because of a wrong sys-libs/zlib version check. it needs sys-libs/zlib at version 1.2.3 or greater whereas it's already installed at version 1.2.3