Hi Simon
I recently tried building a new copy of PDFfit2 for Python 3.9 and came up with a problem via “pip install". The build requires the GSL (Gnu Scientific Library) but the setup.py does not seem to test for that. Once I installed it manually, the build completed. I have not tested it yet, but that will come soon. In any case the build error is below.
Brian
See stack trace in hidden text