Hi again, and sorry for taking so long. It's pretty obvious now: The tests start with
from scipy.spatial.distance import pdist, squareform so they require scipy. I suggest that python-scipy and python3-scipy are added as build-deps. That makes the python2 version build and test fine also in my pbuilder chroot. However, the python3 version now fails with: File "/build/r-cran-fastcluster-1.1.21/src/python/tests/nantest.py", line 7, in <module> Copyright (c) 2011 Daniel M\xfcllner, <http://danifold.net>''') UnicodeEncodeError: 'ascii' codec can't encode character '\xfc' in position 72: ordinal not in range(128) E: pybuild pybuild:276: test: plugin distutils failed with: exit code=1: python3.5 setup.py test The weird thing is that this error does not occur when building on my ordinary system (outside of the pbuilder chroot). Does pbuilder not allow non-ASCII output or something? I guess it's not exactly critical that the upstream author's name is output correctly during the build, but still. Any ideas? -- Best, Gard