old_contents: from spack import *
  import os
  
  class Nccmp(Package):
      """Compare NetCDF Files"""
      homepage = "http://nccmp.sourceforge.net/"
      url      = "http://downloads.sourceforge.net/project/nccmp/nccmp-1.8.2.0.tar.gz"
  
      version('1.8.2.0', '81e6286d4413825aec4327e61a28a580')
  
      depends_on('netcdf')
  
      def install(self, spec, prefix):
          # Configure says: F90 and F90FLAGS are replaced by FC and
          # FCFLAGS respectively in this configure, please unset
          # F90/F90FLAGS and set FC/FCFLAGS instead and rerun configure
          # again.
          os.environ['FC'] = os.environ['F90']
          del os.environ['F90']
          try:
              os.environ['FCFLAGS'] = os.environ['F90FLAGS']
              del os.environ['F90FLAGS']
          except KeyError:    # There are no flags
              pass
  
          configure('--prefix=%s' % prefix)
  
          make()
          make("check")
          make("install")
  
new_contents: from spack import *
  
  class Nccmp(Package):
      """Compare NetCDF Files"""
      homepage = "http://nccmp.sourceforge.net/"
      url      = "http://downloads.sourceforge.net/project/nccmp/nccmp-1.8.2.0.tar.gz"
  
      version('1.8.2.0', '81e6286d4413825aec4327e61a28a580')
  
      depends_on('netcdf')
  
      def install(self, spec, prefix):
          # Configure says: F90 and F90FLAGS are replaced by FC and
          # FCFLAGS respectively in this configure, please unset
          # F90/F90FLAGS and set FC/FCFLAGS instead and rerun configure
          # again.
          env.pop('F90', None)
          env.pop('F90FLAGS', None)
  
          configure('--prefix=%s' % prefix)
          make()
          make("check")
          make("install")
  
subject: Tweak nccmp to be more spack-compatible.