Hello, Your package inherits cmake-utils.eclass and makes a direct call to a base.eclass function without inheriting base.eclass. Since cmake-utils.eclass no longer inherits base, this could cause breakage. Please check your package and either inherit base or make sure that you are implicitly inheriting base.eclass through some other eclass. It may be worthwhile to add the base.eclass inherit even if you already have it inherited through another eclass. Thanks!
Alternatively, cmake-utils now exports src_prepare which should be able to replace the base_src_prepare call entirely. Apologies for not mentioning this in the initial report.
+ 05 Jul 2013; Sergey Popov <pinkbyte@gentoo.org> opencolorio-1.0.8.ebuild: + Call cmake-utils_src_prepare instead of base_src_prepare, wrt bug #475510. + Thanks to Chris Reffett for discovering this issue
*** Bug 475820 has been marked as a duplicate of this bug. ***