Hi, I'm tring to optimize a system with more than 120 atoms using MOPAC into Ghemical, at the moment without results. I want to change the number of maxium atoms in MOPAC. I found from the file mopac7-1.11.tar.gz into the ./fortran subdir seems the SIZES solve it. But each time that I compile, the "make " process takes as source ./src . Do you know the tag to regenerate the ./src from ./fotran? I'm using: ./configure --prefix=/usr make make install Thanks in advance. Álvaro Vázquez Mayagoitia Química UAM-I configuration Red Hat Enterprise Linux 4: gcc-3.4.5-2 f2c-20031026-2.el4.at