********> bugfix.38
Author:   Bill Ross
Date:     9/5/95

Programs: leap

Severity: slight

Problem:  Can't saveamberpampert when no atom perturbation is defined.

Affects:  Prevents setting up a pure PMF perturbation in leap.

Cause:    Overzealous attempt to prevent users from shooting feet.


Fix:  Make the following change to unitio.c (line #s may not be exact):
-------------------------------------------------------------------------
*** OLD unitio.c
--- NEW unitio.c
***************
*** 3595,3606
      }
  
      if ( bPert  &&  iCountPerturbed == 0 ) {
! 	VP0(( "%s %s\n\tSave aborted.",
!      		" No pert atoms defined",
! 		" (PERTURB 'true' in 'Edit selected atoms')" ));
! 	VarArrayDestroy( &vaExcludedAtoms );
! 	VarArrayDestroy( &vaExcludedCount );
! 	RETURNV;
      }
  
  

--- 3620,3627 -----
          VarArrayAdd( vaExcludedCount, &iCount );
      }
      if ( bPert  &&  iCountPerturbed == 0 ) {
! 	VP0(( " (No pert atoms defined - %s\n",
! 		"this 'pert' topology file is only good for PMF.)"));
      }
  
                  /* Build the NON-BOND arrays that AMBER needs */
-------------------------------------------------------------------------

Temporary workarounds: One could try perturbing an atom to itself to
                       work around this restriction.

Routines affected:     saveamberparmpert

--