I have to use CHARMM force field for PEG in water. To better understand how to use CHARMM force field and how charmm program works, I tried to install charmm (free, non-parallel computing edition) on my iMac but failed.
Our nice HPCC manager David Chaffin helped me to install it on the AHPCC with following commands.
module load intel/14.0.3 mkl/14.0.3 impi/5.1.2
./install.com em64t medium M MPIF90