Eventually through fixing DM-8035 and removing DM-7774 and DM-7980 we were able to reproduce DM-8029 using gcc 5.2.0 instead of Conda's gcc 4.8.5.
This is preferable because this uses the same gcc that ContinuumIO uses when they build most official recipes.
conda-lsst Linux lsst-fftw build failure.
daf_persistence test failures with gcc 5.2 on el5
conda-lsst Linux lsst-wcslib build failure.
The Conda v12.1 (semantic version 0.12.1) binaries have been successfully created. The repository for this release is: http://conda.lsst.codes/stack/0.12.1