... necessary.1
A note of warning for the users of the g77 compiler. You might encounter an I/O error when trying to run cases requiring more than 70 exchange potentials. By default g77 accepts file unit numbers in the range 0-99. If you need more files to be opened you have to edit f/runtime/libI77/fio.h in the g77 source tree, changing the line: #define MXUNIT 100. Change the line so that the value of MXUNIT is defined to be at least one greater than the maximum unit number needed.
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