​Oops, found it: I had an installation of libgc in /usr/local. Sorry for the noise.
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- bug#19577: Building 2.0.11, or running pre-built "guile... Reuben Thomas
- bug#19577: Building 2.0.11, or running pre-built "... Reuben Thomas
- bug#19577: Building 2.0.11, or running pre-built &q... Reuben Thomas
- bug#19577: Invalid bug Reuben Thomas
