You’ve got 1.2a1dev624, which by comparison to the main GitHub page, you’ll notice to be about 900 commits old (though still 600 commits ahead of where you started) and hence still non-openmp-compiled. This is probably because you’ve got sse41 for old mac hardware installed. You need to get rid of that ( probably with conda remove --features sse41) and recreate or update your env. You should be at around 1.2rc3dev100 https://anaconda.org/psi4/psi4/files