made grompp mdp input file non-optional, fixes bugzilla 577

diff --git a/src/kernel/grompp.c b/src/kernel/grompp.c
index 1de43620c65eb568864885596b879f0ff81f2372..a2a6021261e47d4b266ccf258d7ba46e6128fb03 100644 (file)
--- a/src/kernel/grompp.c
+++ b/src/kernel/grompp.c
@@ -1195,7 +1195,7 @@ int main (int argc, char *argv[])
   char         warn_buf[STRLEN];
 
   t_filenm fnm[] = {
-    { efMDP, NULL,  NULL,        ffOPTRD },
+    { efMDP, NULL,  NULL,        ffREAD  },
     { efMDP, "-po", "mdout",     ffWRITE },
     { efSTX, "-c",  NULL,        ffREAD  },
     { efSTX, "-r",  NULL,        ffOPTRD },