When I tried to run make dist, it fails:

guix-1.0.1.21330-a8c8f-dirty/gnu/packages/commencement.scm:
  // /gnu/store/cq0cmv35s9dhilx14zaghlc08gpc0hwr-tcc-boot0-0.9.26-6.c004e9a/lib/libc.a: error: 'sigprocmask' defined t
  error: store file names embedded in the distribution

The attached patch triggers pretty extensive rebuilds, but should fix
the problem.

live well,
  vagrant