mouseemu 0.12 doesn't compile on PPC because it lacks an include in its Makefile. The should-be-included directory is the actual-kernel-source. I don't know if ebuilds can include this information and pass this argument to make. Reproducible: Always Steps to Reproduce: 1.emerge sys-apps/mouseemu 2. 3. Actual Results: it can't compile. I modified the Makefile to get it compile. I'll include it as soon as this bug is posted.
Created attachment 42760 [details] Working Makefile for the ebuild
Looks like this has already been fixed. Compiled fine for me and there's a patch in there.