Check build log with -j8.
Created attachment 170210 [details] Build log
Diego, if you're going to just add -j1 without even looking at the Makefiles, I'd prefer it if you didn't edit the games ebuilds anymore. Worked around the broken makefile and removed the weak -j1 in portage.
The -j1 was just a workaround in its own, I've added -j1 to the packages failing (so that people wouldn't find them failing) and opened bugs so that the problem was known _present_ and not "fixed". I agree -j1 is not a fix, yours is.