I have installed gfortran but sudo pip3 install pymc fails:
IOError: [Errno 2] No such file or directory: 'lapack/double/dpotrs.f'. Skipping file "lapack/double/dpotrs.
IOError: [Errno 2] No such file or directory: 'lapack/double/dpotrf.f'. Skipping file "lapack/double/dpotrf.
IOError: [Errno 2] No such file or directory: 'lapack/double/dpotf2.f'. Skipping file "lapack/double/dpotf2.
IOError: [Errno 2] No such file or directory: 'lapack/double/ilaenv.f'. Skipping file "lapack/double/ilaenv.
IOError: [Errno 2] No such file or directory: 'lapack/double/dlamch.f'. Skipping file "lapack/double/dlamch.
IOError: [Errno 2] No such file or directory: 'lapack/double/ilaver.f'. Skipping file "lapack/double/ilaver.
IOError: [Errno 2] No such file or directory: 'lapack/double/ieeeck.f'. Skipping file "lapack/double/ieeeck.
IOError: [Errno 2] No such file or directory: 'lapack/double/iparmq.f'. Skipping file "lapack/double/iparmq.
IOError: [Errno 2] No such file or directory: 'lapack/double/dpotrs.f'. Skipping file "lapack/double/dpotrs.
IOError: [Errno 2] No such file or directory: 'lapack/double/dpotrf.f'. Skipping file "lapack/double/dpotrf.
IOError: [Errno 2] No such file or directory: 'lapack/double/dpotf2.f'. Skipping file "lapack/double/dpotf2.
IOError: [Errno 2] No such file or directory: 'lapack/double/ilaenv.f'. Skipping file "lapack/double/ilaenv.
IOError: [Errno 2] No such file or directory: 'lapack/double/dlamch.f'. Skipping file "lapack/double/dlamch.
IOError: [Errno 2] No such file or directory: 'lapack/double/ilaver.f'. Skipping file "lapack/double/ilaver.
IOError: [Errno 2] No such file or directory: 'lapack/double/ieeeck.f'. Skipping file "lapack/double/ieeeck.f".
IOError: [Errno 2] No such file or directory: 'lapack/double/iparmq.f'. Skipping file "lapack/double/iparmq.f".
error: [Errno 2] No such file or directory: 'lapack/double/dpotrs.f'
----------------------------------------
Cleaning up...
Command /usr/bin/python3 -c "import setuptools, tokenize;__file__='/tmp/pip-build-hmfp8b5m/pymc/setup.py';exec(compile(getattr(tokenize, 'open', open)(__file__).read().replace('\r\n', '\n'), __file__, 'exec'))" install --record /tmp/pip-zyseyo76-record/install-record.txt --single-version-externally-managed --compile failed with error code 1 in /tmp/pip-build-hmfp8b5m/pymc
Storing debug log for failure in /root/.pip/pip.log
I think I figured it out, I was missing the liblapack-dev package:
sudo apt-get install liblapack-dev