old_contents: from spack import *
  
  class Arpack(Package):
      """FIXME: put a proper description of your package here."""
      homepage = "http://www.caam.rice.edu/software/ARPACK/"
      url      = "http://www.caam.rice.edu/software/ARPACK/SRC/arpack96.tar.gz"
  
      version('96', 'fffaa970198b285676f4156cebc8626e')
  
      depends_on('blas')
      depends_on('lapack')
  
      def install(self, spec, prefix):
          move('./ARMAKES/ARmake.CRAY', './ARmake.inc')
          filter_file('PLAT          = CRAY', 'PLAT = ', './ARmake.inc', string=True)
          filter_file('home = $(HOME)/ARPACK', 'home = %s' % pwd(), './ARmake.inc', string=True)
          filter_file('BLASdir      = $(home)/BLAS', 'BLASdir = %s' % spec['blas'].prefix, './ARmake.inc', string=True)
          filter_file('LAPACKdir    = $(home)/LAPACK', 'LAPACKdir = %s' % spec['lapack'].prefix, './ARmake.inc', string=True)
          filter_file('ARPACKLIB  = $(home)/libarpack_$(PLAT).a', 'ARPACKLIB = %s/lib/libarpack.a' % prefix, './ARmake.inc', string=True)
          
          cd('./SRC')
          make('all')
  
new_contents: from spack import *
  
  class Arpack(Package):
      """A collection of Fortran77 subroutines designed to solve large scale
         eigenvalue problems.
      """
      homepage = "http://www.caam.rice.edu/software/ARPACK/"
      url      = "http://www.caam.rice.edu/software/ARPACK/SRC/arpack96.tar.gz"
  
      version('96', 'fffaa970198b285676f4156cebc8626e')
  
      depends_on('blas')
      depends_on('lapack')
  
      def patch(self):
          # Filter the cray makefile to make a spack one.
          move('ARMAKES/ARmake.CRAY', 'ARmake.inc')
          makefile = FileFilter('ARmake.inc')
  
          # Be sure to use Spack F77 wrapper
          makefile.filter('^FC.*', 'FC = f77')
  
          # Set up some variables.
          makefile.filter('^PLAT.*',      'PLAT = ')
          makefile.filter('^home =.*',    'home = %s' % pwd())
          makefile.filter('^BLASdir.*',   'BLASdir = %s' % self.spec['blas'].prefix)
          makefile.filter('^LAPACKdir.*', 'LAPACKdir = %s' % self.spec['lapack'].prefix)
  
          # build the library in our own prefix.
          makefile.filter('^ARPACKLIB.*', 'ARPACKLIB = %s/lib/libarpack.a' % self.prefix)
  
  
      def install(self, spec, prefix):
          with working_dir('SRC'):
              make('all')
  
subject: Clean up arpack build, use the Spack f77 compiler.