Created attachment 332976 [details, diff] The diff to the ebuild 1) cmake-utils is BUILD_DIR-aware, there's no need to map it to CMAKE_BUILD_DIR, 2) the ebuild should call 'python_optimize' in my_impl_src_install() to compile the installed modules, 3) missing || die in 'cd'. I'm attaching a diff for the ebuild.
Thanks for the patch, applied. + 23 Dec 2012; Justin Lecher <jlec@gentoo.org> openbabel-python-2.3.2.ebuild, + metadata.xml: + Add proposed enhancements by mgorny, #448118 +