src_test() { python_export_best ${PYTHON} tests/test_cdiff.py || die "Unit tests failed." ./tests/regression.sh || die "Regression tests failed." } which means that package is built for max 4 Python versions but tested only for one of them. Please use python_test() instead and test for each version, or disable multi-version support.
Thank you very much. + 10 Nov 2013; Tom Wijsman <TomWij@gentoo.org> cdiff-0.9.2.ebuild, + cdiff-0.9.3.ebuild, cdiff-9999.ebuild: + Sync up 0.9.2, 0.9.3 and 9999 versions, as they were not edited together; + changed src_test to python_test as requested by mgorny, fixes bug #489538.