********> bugfix.16
Author:  Dave Case
Date:    5/25/00

Programs: gibbs

Severity: catastrophic if PME is used, on SGI and perhaps other platforms

Description: a double-precision delcaration is missing; this only affects
             systems (such as SGI) where -DHAS_FTN_ERFC is set in the
             Machine file.

Fix:  Make the following change to src/gibbs/ewald.f
----------------------------------------------------------------------------
*** ewald.f.old Tue Feb  8 17:09:25 2000
--- ewald.f     Thu May 25 08:28:12 2000
***************
*** 837,843 ****
        end
  c
        subroutine derfcfun(x,y)
!       double precision x,y
  #ifdef CRAYFISH
        y = erfc(x)
  #else
--- 837,843 ----
        end
  c
        subroutine derfcfun(x,y)
!       double precision x,y,derfc
  #ifdef CRAYFISH
        y = erfc(x)
  #else
----------------------------------------------------------------------------