$ ls /usr/share/doc/cairomm-1.* /usr/share/doc/cairomm-1.0: reference /usr/share/doc/cairomm-1.10.0: AUTHORS.bz2 ChangeLog.bz2 NEWS.bz2 README.bz2 Fixed for me by adding to src_prepare(): sed -i 's:libdocdir = \$(datarootdir)/doc/\$(book_name):libdocdir = /usr/share/doc/${PF}:' docs/Makefile.in || die "sed failed"
+ 29 Sep 2013; Pacho Ramos <pacho@gentoo.org> cairomm-1.10.0.ebuild: + Fix docs installation patch, #443950 by Chris Mayo +
This fix is wrong because it breaks html links in gtkmm documentation, which are determined at gtkmm's build time, and therefore must not change when cairomm is version- or revision-bumped. Just like with gtk-docs, the *mm packages need to install their doxygen API docs in a fixed location determined by the upstream build system. I will be reverting this in cairomm-1.10.0-r1.