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diff --git a/third_party/waf/waflib/Tools/gfortran.py b/third_party/waf/waflib/Tools/gfortran.py
new file mode 100644
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+++ b/third_party/waf/waflib/Tools/gfortran.py
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+#! /usr/bin/env python
+# encoding: utf-8
+# DC 2008
+# Thomas Nagy 2016-2018 (ita)
+
+import re
+from waflib import Utils
+from waflib.Tools import fc, fc_config, fc_scan, ar
+from waflib.Configure import conf
+
+@conf
+def find_gfortran(conf):
+	"""Find the gfortran program (will look in the environment variable 'FC')"""
+	fc = conf.find_program(['gfortran','g77'], var='FC')
+	# (fallback to g77 for systems, where no gfortran is available)
+	conf.get_gfortran_version(fc)
+	conf.env.FC_NAME = 'GFORTRAN'
+
+@conf
+def gfortran_flags(conf):
+	v = conf.env
+	v.FCFLAGS_fcshlib = ['-fPIC']
+	v.FORTRANMODFLAG = ['-J', ''] # template for module path
+	v.FCFLAGS_DEBUG = ['-Werror'] # why not
+
+@conf
+def gfortran_modifier_win32(conf):
+	fc_config.fortran_modifier_win32(conf)
+
+@conf
+def gfortran_modifier_cygwin(conf):
+	fc_config.fortran_modifier_cygwin(conf)
+
+@conf
+def gfortran_modifier_darwin(conf):
+	fc_config.fortran_modifier_darwin(conf)
+
+@conf
+def gfortran_modifier_platform(conf):
+	dest_os = conf.env.DEST_OS or Utils.unversioned_sys_platform()
+	gfortran_modifier_func = getattr(conf, 'gfortran_modifier_' + dest_os, None)
+	if gfortran_modifier_func:
+		gfortran_modifier_func()
+
+@conf
+def get_gfortran_version(conf, fc):
+	"""Get the compiler version"""
+
+	# ensure this is actually gfortran, not an imposter.
+	version_re = re.compile(r"GNU\s*Fortran", re.I).search
+	cmd = fc + ['--version']
+	out, err = fc_config.getoutput(conf, cmd, stdin=False)
+	if out:
+		match = version_re(out)
+	else:
+		match = version_re(err)
+	if not match:
+		conf.fatal('Could not determine the compiler type')
+
+	# --- now get more detailed info -- see c_config.get_cc_version
+	cmd = fc + ['-dM', '-E', '-']
+	out, err = fc_config.getoutput(conf, cmd, stdin=True)
+
+	if out.find('__GNUC__') < 0:
+		conf.fatal('Could not determine the compiler type')
+
+	k = {}
+	out = out.splitlines()
+	import shlex
+
+	for line in out:
+		lst = shlex.split(line)
+		if len(lst)>2:
+			key = lst[1]
+			val = lst[2]
+			k[key] = val
+
+	def isD(var):
+		return var in k
+
+	def isT(var):
+		return var in k and k[var] != '0'
+
+	conf.env.FC_VERSION = (k['__GNUC__'], k['__GNUC_MINOR__'], k['__GNUC_PATCHLEVEL__'])
+
+def configure(conf):
+	conf.find_gfortran()
+	conf.find_ar()
+	conf.fc_flags()
+	conf.fc_add_flags()
+	conf.gfortran_flags()
+	conf.gfortran_modifier_platform()
+	conf.check_gfortran_o_space()