materials

site_init.py
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			def fftw(env):
			"""A Tool to search for fftw headers and libraries"""

			if env.GetOption('clean'): return
			env.SetDefault(FFTW_VERSION='3')
			env.SetDefault(FFTW_LIBRARY_WISH=[])

			print("FFTW_VERSION={0}".format(env['FFTW_VERSION']))

			if 'FFTW_INCLUDE_DIR' in env:
			env.AppendUnique(CPPPATH=env['FFTW_INCLUDE_DIR'])

			if 'FFTW_LIBRARY_DIR' in env:
			env.AppendUnique(LIBPATH=env['FFTW_LIBRARY_DIR'])

			version = env['FFTW_VERSION']
			if version == "2":
			lib_names = {'main':'fftw'}
			inc_names = ['fftw.h']
			else:
			lib_names = {'main':'fftw3','thread':'fftw3_threads','omp':'fftw3_omp'}
			inc_names = ['fftw3.h']

			try:
			libs = [lib_names[i] for i in env['FFTW_LIBRARY_WISH']]
			except:
			raise SCons.Errors.StopError(
			'Incompatible wishlist {0} from version {1}'.format(
			env['FFTW_LIBRARY_WISH'], env['FFTW_VERSION']))

			env.AppendUnique(LIBS=libs)
			if version == "2":
			env.Append(LIBS='m')

			conf = Configure(env)
			if not conf.CheckLibWithHeader(libs, inc_names, 'c++'):
			raise SCons.Errors.StopError(
			'Failed to find libraries {0} or '
			'headers {1}.'.format(str(lib_names), str(inc_names)))

			env = conf.Finish()