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diff --git a/third_party/waf/waflib/extras/swig.py b/third_party/waf/waflib/extras/swig.py
new file mode 100644
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--- /dev/null
+++ b/third_party/waf/waflib/extras/swig.py
@@ -0,0 +1,237 @@
+#! /usr/bin/env python
+# encoding: UTF-8
+# Petar Forai
+# Thomas Nagy 2008-2010 (ita)
+
+import re
+from waflib import Task, Logs
+from waflib.TaskGen import extension, feature, after_method
+from waflib.Configure import conf
+from waflib.Tools import c_preproc
+
+"""
+tasks have to be added dynamically:
+- swig interface files may be created at runtime
+- the module name may be unknown in advance
+"""
+
+SWIG_EXTS = ['.swig', '.i']
+
+re_module = re.compile(r'%module(?:\s*\(.*\))?\s+([^\r\n]+)', re.M)
+
+re_1 = re.compile(r'^%module.*?\s+([\w]+)\s*?$', re.M)
+re_2 = re.compile(r'[#%](?:include|import(?:\(module=".*"\))+|python(?:begin|code)) [<"](.*)[">]', re.M)
+
+class swig(Task.Task):
+	color   = 'BLUE'
+	run_str = '${SWIG} ${SWIGFLAGS} ${SWIGPATH_ST:INCPATHS} ${SWIGDEF_ST:DEFINES} ${SRC}'
+	ext_out = ['.h'] # might produce .h files although it is not mandatory
+	vars = ['SWIG_VERSION', 'SWIGDEPS']
+
+	def runnable_status(self):
+		for t in self.run_after:
+			if not t.hasrun:
+				return Task.ASK_LATER
+
+		if not getattr(self, 'init_outputs', None):
+			self.init_outputs = True
+			if not getattr(self, 'module', None):
+				# search the module name
+				txt = self.inputs[0].read()
+				m = re_module.search(txt)
+				if not m:
+					raise ValueError("could not find the swig module name")
+				self.module = m.group(1)
+
+			swig_c(self)
+
+			# add the language-specific output files as nodes
+			# call funs in the dict swig_langs
+			for x in self.env['SWIGFLAGS']:
+				# obtain the language
+				x = x[1:]
+				try:
+					fun = swig_langs[x]
+				except KeyError:
+					pass
+				else:
+					fun(self)
+
+		return super(swig, self).runnable_status()
+
+	def scan(self):
+		"scan for swig dependencies, climb the .i files"
+		lst_src = []
+
+		seen = []
+		missing = []
+		to_see = [self.inputs[0]]
+
+		while to_see:
+			node = to_see.pop(0)
+			if node in seen:
+				continue
+			seen.append(node)
+			lst_src.append(node)
+
+			# read the file
+			code = node.read()
+			code = c_preproc.re_nl.sub('', code)
+			code = c_preproc.re_cpp.sub(c_preproc.repl, code)
+
+			# find .i files and project headers
+			names = re_2.findall(code)
+			for n in names:
+				for d in self.generator.includes_nodes + [node.parent]:
+					u = d.find_resource(n)
+					if u:
+						to_see.append(u)
+						break
+				else:
+					missing.append(n)
+		return (lst_src, missing)
+
+# provide additional language processing
+swig_langs = {}
+def swigf(fun):
+	swig_langs[fun.__name__.replace('swig_', '')] = fun
+	return fun
+swig.swigf = swigf
+
+def swig_c(self):
+	ext = '.swigwrap_%d.c' % self.generator.idx
+	flags = self.env['SWIGFLAGS']
+	if '-c++' in flags:
+		ext += 'xx'
+	out_node = self.inputs[0].parent.find_or_declare(self.module + ext)
+
+	if '-c++' in flags:
+		c_tsk = self.generator.cxx_hook(out_node)
+	else:
+		c_tsk = self.generator.c_hook(out_node)
+
+	c_tsk.set_run_after(self)
+
+	# transfer weights from swig task to c task
+	if getattr(self, 'weight', None):
+		c_tsk.weight = self.weight
+	if getattr(self, 'tree_weight', None):
+		c_tsk.tree_weight = self.tree_weight
+
+	try:
+		self.more_tasks.append(c_tsk)
+	except AttributeError:
+		self.more_tasks = [c_tsk]
+
+	try:
+		ltask = self.generator.link_task
+	except AttributeError:
+		pass
+	else:
+		ltask.set_run_after(c_tsk)
+		# setting input nodes does not declare the build order
+		# because the build already started, but it sets
+		# the dependency to enable rebuilds
+		ltask.inputs.append(c_tsk.outputs[0])
+
+	self.outputs.append(out_node)
+
+	if not '-o' in self.env['SWIGFLAGS']:
+		self.env.append_value('SWIGFLAGS', ['-o', self.outputs[0].abspath()])
+
+@swigf
+def swig_python(tsk):
+	node = tsk.inputs[0].parent
+	if tsk.outdir:
+		node = tsk.outdir
+	tsk.set_outputs(node.find_or_declare(tsk.module+'.py'))
+
+@swigf
+def swig_ocaml(tsk):
+	node = tsk.inputs[0].parent
+	if tsk.outdir:
+		node = tsk.outdir
+	tsk.set_outputs(node.find_or_declare(tsk.module+'.ml'))
+	tsk.set_outputs(node.find_or_declare(tsk.module+'.mli'))
+
+@extension(*SWIG_EXTS)
+def i_file(self, node):
+	# the task instance
+	tsk = self.create_task('swig')
+	tsk.set_inputs(node)
+	tsk.module = getattr(self, 'swig_module', None)
+
+	flags = self.to_list(getattr(self, 'swig_flags', []))
+	tsk.env.append_value('SWIGFLAGS', flags)
+
+	tsk.outdir = None
+	if '-outdir' in flags:
+		outdir = flags[flags.index('-outdir')+1]
+		outdir = tsk.generator.bld.bldnode.make_node(outdir)
+		outdir.mkdir()
+		tsk.outdir = outdir
+
+@feature('c', 'cxx', 'd', 'fc', 'asm')
+@after_method('apply_link', 'process_source')
+def enforce_swig_before_link(self):
+	try:
+		link_task = self.link_task
+	except AttributeError:
+		pass
+	else:
+		for x in self.tasks:
+			if x.__class__.__name__ == 'swig':
+				link_task.run_after.add(x)
+
+@conf
+def check_swig_version(conf, minver=None):
+	"""
+	Check if the swig tool is found matching a given minimum version.
+	minver should be a tuple, eg. to check for swig >= 1.3.28 pass (1,3,28) as minver.
+
+	If successful, SWIG_VERSION is defined as 'MAJOR.MINOR'
+	(eg. '1.3') of the actual swig version found.
+
+	:param minver: minimum version
+	:type minver: tuple of int
+	:return: swig version
+	:rtype: tuple of int
+	"""
+	assert minver is None or isinstance(minver, tuple)
+	swigbin = conf.env['SWIG']
+	if not swigbin:
+		conf.fatal('could not find the swig executable')
+
+	# Get swig version string
+	cmd = swigbin + ['-version']
+	Logs.debug('swig: Running swig command %r', cmd)
+	reg_swig = re.compile(r'SWIG Version\s(.*)', re.M)
+	swig_out = conf.cmd_and_log(cmd)
+	swigver_tuple = tuple([int(s) for s in reg_swig.findall(swig_out)[0].split('.')])
+
+	# Compare swig version with the minimum required
+	result = (minver is None) or (swigver_tuple >= minver)
+
+	if result:
+		# Define useful environment variables
+		swigver = '.'.join([str(x) for x in swigver_tuple[:2]])
+		conf.env['SWIG_VERSION'] = swigver
+
+	# Feedback
+	swigver_full = '.'.join(map(str, swigver_tuple[:3]))
+	if minver is None:
+		conf.msg('Checking for swig version', swigver_full)
+	else:
+		minver_str = '.'.join(map(str, minver))
+		conf.msg('Checking for swig version >= %s' % (minver_str,), swigver_full, color=result and 'GREEN' or 'YELLOW')
+
+	if not result:
+		conf.fatal('The swig version is too old, expecting %r' % (minver,))
+
+	return swigver_tuple
+
+def configure(conf):
+	conf.find_program('swig', var='SWIG')
+	conf.env.SWIGPATH_ST = '-I%s'
+	conf.env.SWIGDEF_ST = '-D%s'
+