Hello! Sorry for the delay.
gcc 7.5.0
gfortran 7.5.0
cmake 3.10.2

It's a free version of CHARMM, I downloaded it from http://charmm.chemistry.harvard.edu/charmm_lite.php

I used the ./configure procedure, following instructions from the given website (as they are pretty simple and straightforward) and it didn't work as I mentioned, at the 'make' stage I have the following error (on the picture).
https://www.dropbox.com/s/3irn1gai3yj941j/Screenshot%20from%202020-10-30%2013-45-30.png?dl=0


Student of Chemoinformatics in the University of Strasbourg