text: #!/usr/bin/env python
  # encoding: utf-8
  
  import os, sys, imp, types, re
  from waflib import Utils, Configure, Options, Logs, Errors
  from waflib.Tools import fc
  
  fc_compiler = {
  	'win32'  : ['gfortran','ifort'],
  	'darwin' : ['gfortran', 'g95', 'ifort'],
  	'linux'  : ['gfortran', 'g95', 'ifort'],
  	'java'   : ['gfortran', 'g95', 'ifort'],
  	'default': ['gfortran'],
  	'aix'    : ['gfortran']
  }
  """
  Dict mapping the platform names to lists of names of Fortran compilers to try, in order of preference::
  
  	from waflib.Tools.compiler_c import c_compiler
  	c_compiler['linux'] = ['gfortran', 'g95', 'ifort']
  """
  
  def default_compilers():
  	build_platform = Utils.unversioned_sys_platform()
  	possible_compiler_list = fc_compiler.get(build_platform, fc_compiler['default'])
  	return ' '.join(possible_compiler_list)
  
  def configure(conf):
  	"""
  	Try to find a suitable Fortran compiler or raise a :py:class:`waflib.Errors.ConfigurationError`.
  	"""
  	try: test_for_compiler = conf.options.check_fortran_compiler or default_compilers()
  	except AttributeError: conf.fatal("Add options(opt): opt.load('compiler_fc')")
  	for compiler in re.split('[ ,]+', test_for_compiler):
  		conf.env.stash()
  		conf.start_msg('Checking for %r (Fortran compiler)' % compiler)
  		try:
  			conf.load(compiler)
  		except conf.errors.ConfigurationError as e:
  			conf.env.revert()
  			conf.end_msg(False)
  			Logs.debug('compiler_fortran: %r' % e)
  		else:
  			if conf.env['FC']:
  				conf.end_msg(conf.env.get_flat('FC'))
  				conf.env.COMPILER_FORTRAN = compiler
  				break
  			conf.end_msg(False)
  	else:
  		conf.fatal('could not configure a Fortran compiler!')
  
  def options(opt):
  	"""
  	Restrict the compiler detection from the command-line::
  
  		$ waf configure --check-fortran-compiler=ifort
  	"""
  	test_for_compiler = default_compilers()
  	opt.load_special_tools('fc_*.py')
  	fortran_compiler_opts = opt.add_option_group('Configuration options')
  	fortran_compiler_opts.add_option('--check-fortran-compiler', default=None,
  			help='list of Fortran compiler to try [%s]' % test_for_compiler,
  		dest="check_fortran_compiler")
  
  	for x in test_for_compiler.split():
  		opt.load('%s' % x)
  
  