********> bugfix.21

Author: D.A. Case
Date:   March, 1998

Description:  Potential update to Machine.g77 to allow smoother compilation.

Fix:  Link the following file to AMBER5/src/MACHINE if you are using g77.
      Since g77 configurations vary, minor revisions may be required,
      but this should get you most of the way.

***** Note: For some older g77's, delete -fno-globals

***** Further note from Thomas Huber:

If errors occur with the routine second():

         call second(wtim0)
              ^
  Reference to intrinsic `SECOND' at (^) invalid -- 
	one or more arguments have incorrect type

The problem with the latest release of GNU g77 (0.5.21) is, that SECOND is
actually an intrinsic function.  A clean workaround is to define in the 
MACHINE file:

  setenv CPP "/lib/cpp -traditional -DSECOND=secondx -Dsecond=secondx"

With this option all occurrences of second in the sander source code are
replaced by a new name secondx!

***** Further note from Bill Ross:

If these errors are encountered in compiling Machine/f2c/etime.c:

  etime.c:30: `CLOCKS_PER_SEC' undeclared (first use this function)
  etime.c:38: `time_t' undeclared (first use this function)

add:

  #inlude <time.h>

at the beginning of etime.c

------------------------------------------ Machine.g77:
#! /bin/csh -f
########################################################################
#                                                                      #
#                Copyright (c) 1986, 1991, 1995                        #
#           Regents of the University of California                    #
#                                                                      #
#                    All Rights Reserved                               #
#                                                                      #
#             Machine Dependency Handling System                       #
#                                                                      #
#                Bill Ross ross@cgl.ucsf.edu                           #
#            An extension of work of George Seibel                     #
#                                                                      #
#           Dependencies written by various authors.                   #
#                                                                      #
#  Permission to use, copy, modify, and distribute this software and   #
#  its documentation for any purpose and without fee is hereby         #
#  granted, provided that the above copyright notice appear in all     #
#  copies and that both that copyright notice and this permission      #
#  notice appear in supporting documentation, and that the name of     #
#  the University of California not be used in advertising or          #
#  publicity pertaining to distribution of the software without        #
#  specific, written prior permission.                                 #
#                                                                      #
#  THE REGENTS OF THE UNIVERSITY OF CALIFORNIA DISCLAIM ALL            #
#  WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED      #
#  WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL THE    #
#  UNIVERSITY OF CALIFORNIA BE LIABLE FOR ANY SPECIAL, INDIRECT OR     #
#  CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM      #
#  LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,     #
#  NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN           #
#  CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.            #
#                                                                      #
########################################################################

#
# Machine dependencies adapted from f2c version of Thomas Huber.
#
#    When using g77 it is important to resize the COMMON blocks 
#    if you are using ld version less than 2.6! The other option 
#    is to download binutils-2.6 from GNU and the default sizes 
#    works fine. I have done both and there is no problem.
#  
#    Dr. R.R. Joshi, Bioinformatics Centre, University of Poona, India
# 
# Copy this file to .../src/MACHINE to install.
#
# These aliases let us use the same command files for compilation
# on Unix systems with different names and/or flags for the fortran
# compiler.   Environment variables set here specify the location
# of system-specific source and control the use of Integer*2.
# See install.doc: "Setting Up the Configuration File"
#
#
setenv MACHINE "linux/FreeBSD PC"
setenv MACH F2C
setenv MACHINEFLAGS "-DISTAR2 -DREGNML -DEWALD -DHAS_FTN_ERFC " 

# CPP is the cpp for this machine
setenv CPP "/lib/cpp -traditional "


# SYSDIR is the name of the system-specific source directory relative to src/*/
setenv SYSDIR Machine/f2c

# COMPILER ALIASES:

# LOADER/LINKER:
setenv LOAD "g77 -O6"
setenv LOADLIB "-lm"

setenv G77_COMPAT "-fno-globals -ff90 -funix-intrinsics-hide"

# little or no optimization:
setenv L0 "g77 -c -g"

# modest optimization (local scalar):
setenv L1 "g77 -c -O -m486 -malign-double -ffast-math -fomit-frame-pointer $G77_COMPAT"

# high scalar optimization (but not vectorization):
setenv L2 "g77 -c -O3 -m486 -malign-double -ffast-math -fomit-frame-pointer $G77_COMPAT"

# high optimization (may be vectorization, not parallelization):
setenv L3 "g77 -c -O3 -m486 -malign-double -ffast-math -fomit-frame-pointer $G77_COMPAT"

# ranlib, if it exists
setenv RANLIB ranlib

# spasms configuration
#SPASMS MACHINE.f2c_spasms_config
#SPASMS unix
#SPASMS n390
#SPASMS large