The ebuild in summary is currently forcing users to use serial make (-j1, no
extra job tasks). This seems not to be needed.
The ebuild was modified to use -j8 on a truly 8-core SMP system and didn't fail
the build, you should either check if it's a particular USE flag to cause the
problem, or drop -j1 and leave the user to decide how many jobs to use.
I want to remember you that with modern multicore systems, forcing serial make
is going to waste a lot of time and resources for users..
Thanks,
Diego