openal-config was in older openal ebuilds and it's not anymore but fakenes still tries to use it. Build isn't failing but it's still a QA issue.
I will not provide an entire build log because it's not really useful. You just have to check at the end of the compilation phase, you got: Linking fakenes... sh: openal-config: command not found >>> Source compiled. >>> Test phase [not enabled]: games-emulation/fakenes-0.5.8 By the way, it needs USE="openal" to be reproduce.
Fixed in portage. Thanks for report