Gentoo's Bugzilla –
Attachment 391544 Details for
Bug 532426media-libs/libraw-0.16.0-r1- media-libs/libraw-0.16.2 with dev-util/cmake-3.0.2 thru 3.2.2 - src_install(): CMake Error at cmake_install.cmake:129 (file): file called with network path DESTINATION. This does not make sense when using DESTDIR.