At least dev-libs/ucl is missing in the ppc-stage3 to properly build a kernel with crypto-functions. On future releases, please include dev-libs/ucl. Reproducible: Always Steps to Reproduce:
Stage 3 is taken from the system profile. If UCL is a dependency required for building a part of the kernel, I would think it should be a dep of ppc-sources, no?
DEPEND="${DEPEND} >=dev-libs/ucl-1" in gentoo-dev-sources (which works with ppc) so yep, it will get pulled in.