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diff --git a/waflib/extras/protoc.py b/waflib/extras/protoc.py
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+#!/usr/bin/env python
+# encoding: utf-8
+# Philipp Bender, 2012
+# Matt Clarkson, 2012
+
+import re, os
+from waflib.Task import Task
+from waflib.TaskGen import extension
+from waflib import Errors, Context
+
+"""
+A simple tool to integrate protocol buffers into your build system.
+
+Example for C++:
+
+    def configure(conf):
+        conf.load('compiler_cxx cxx protoc')
+
+    def build(bld):
+        bld(
+                features = 'cxx cxxprogram'
+                source   = 'main.cpp file1.proto proto/file2.proto',
+                includes = '. proto',
+                target   = 'executable')
+
+Example for Python:
+
+    def configure(conf):
+        conf.load('python protoc')
+
+    def build(bld):
+        bld(
+                features = 'py'
+                source   = 'main.py file1.proto proto/file2.proto',
+                protoc_includes  = 'proto')
+
+Example for both Python and C++ at same time:
+
+    def configure(conf):
+        conf.load('cxx python protoc')
+
+    def build(bld):
+        bld(
+                features = 'cxx py'
+                source   = 'file1.proto proto/file2.proto',
+                protoc_includes  = 'proto')	# or includes
+
+
+Example for Java:
+
+    def options(opt):
+        opt.load('java')
+
+    def configure(conf):
+        conf.load('python java protoc')
+        # Here you have to point to your protobuf-java JAR and have it in classpath
+        conf.env.CLASSPATH_PROTOBUF = ['protobuf-java-2.5.0.jar']
+
+    def build(bld):
+        bld(
+                features = 'javac protoc',
+                name = 'pbjava',
+                srcdir = 'inc/ src',	# directories used by javac
+                source   = ['inc/message_inc.proto', 'inc/message.proto'],
+					# source is used by protoc for .proto files
+                use = 'PROTOBUF',
+                protoc_includes = ['inc']) # for protoc to search dependencies
+
+
+
+
+Notes when using this tool:
+
+- protoc command line parsing is tricky.
+
+  The generated files can be put in subfolders which depend on
+  the order of the include paths.
+
+  Try to be simple when creating task generators
+  containing protoc stuff.
+
+"""
+
+class protoc(Task):
+	run_str = '${PROTOC} ${PROTOC_FL:PROTOC_FLAGS} ${PROTOC_ST:INCPATHS} ${PROTOC_ST:PROTOC_INCPATHS} ${SRC[0].bldpath()}'
+	color   = 'BLUE'
+	ext_out = ['.h', 'pb.cc', '.py', '.java']
+	def scan(self):
+		"""
+		Scan .proto dependencies
+		"""
+		node = self.inputs[0]
+
+		nodes = []
+		names = []
+		seen = []
+		search_nodes = []
+
+		if not node:
+			return (nodes, names)
+
+		if 'cxx' in self.generator.features:
+			search_nodes = self.generator.includes_nodes
+
+		if 'py' in self.generator.features or 'javac' in self.generator.features:
+			for incpath in getattr(self.generator, 'protoc_includes', []):
+				search_nodes.append(self.generator.bld.path.find_node(incpath))
+
+		def parse_node(node):
+			if node in seen:
+				return
+			seen.append(node)
+			code = node.read().splitlines()
+			for line in code:
+				m = re.search(r'^import\s+"(.*)";.*(//)?.*', line)
+				if m:
+					dep = m.groups()[0]
+					for incnode in search_nodes:
+						found = incnode.find_resource(dep)
+						if found:
+							nodes.append(found)
+							parse_node(found)
+						else:
+							names.append(dep)
+
+		parse_node(node)
+		# Add also dependencies path to INCPATHS so protoc will find the included file
+		for deppath in nodes:
+			self.env.append_value('INCPATHS', deppath.parent.bldpath())
+		return (nodes, names)
+
+@extension('.proto')
+def process_protoc(self, node):
+	incdirs = []
+	out_nodes = []
+	protoc_flags = []
+
+	# ensure PROTOC_FLAGS is a list; a copy is used below anyway
+	self.env.PROTOC_FLAGS = self.to_list(self.env.PROTOC_FLAGS)
+
+	if 'cxx' in self.features:
+		cpp_node = node.change_ext('.pb.cc')
+		hpp_node = node.change_ext('.pb.h')
+		self.source.append(cpp_node)
+		out_nodes.append(cpp_node)
+		out_nodes.append(hpp_node)
+		protoc_flags.append('--cpp_out=%s' % node.parent.get_bld().bldpath())
+
+	if 'py' in self.features:
+		py_node = node.change_ext('_pb2.py')
+		self.source.append(py_node)
+		out_nodes.append(py_node)
+		protoc_flags.append('--python_out=%s' % node.parent.get_bld().bldpath())
+
+	if 'javac' in self.features:
+		pkgname, javapkg, javacn, nodename = None, None, None, None
+		messages = []
+
+		# .java file name is done with some rules depending on .proto file content:
+		#   -) package is either derived from option java_package if present
+		#      or from package directive
+		#   -) file name is either derived from option java_outer_classname if present
+		#      or the .proto file is converted to camelcase. If a message
+		#      is named the same then the behaviour depends on protoc version
+		#
+		# See also: https://developers.google.com/protocol-buffers/docs/reference/java-generated#invocation
+
+		code = node.read().splitlines()
+		for line in code:
+			m = re.search(r'^package\s+(.*);', line)
+			if m:
+				pkgname = m.groups()[0]
+			m = re.search(r'^option\s+(\S*)\s*=\s*"(\S*)";', line)
+			if m:
+				optname = m.groups()[0]
+				if optname == 'java_package':
+					javapkg = m.groups()[1]
+				elif optname == 'java_outer_classname':
+					javacn = m.groups()[1]
+			if self.env.PROTOC_MAJOR > '2':
+				m = re.search(r'^message\s+(\w*)\s*{*', line)
+				if m:
+					messages.append(m.groups()[0])
+
+		if javapkg:
+			nodename = javapkg
+		elif pkgname:
+			nodename = pkgname
+		else:
+			raise Errors.WafError('Cannot derive java name from protoc file')
+
+		nodename = nodename.replace('.',os.sep) + os.sep
+		if javacn:
+			nodename += javacn + '.java'
+		else:
+			if self.env.PROTOC_MAJOR > '2' and node.abspath()[node.abspath().rfind(os.sep)+1:node.abspath().rfind('.')].title() in messages:
+				nodename += node.abspath()[node.abspath().rfind(os.sep)+1:node.abspath().rfind('.')].title().replace('_','') + 'OuterClass.java'
+			else:
+				nodename += node.abspath()[node.abspath().rfind(os.sep)+1:node.abspath().rfind('.')].title().replace('_','') + '.java'
+
+		java_node = node.parent.find_or_declare(nodename)
+		out_nodes.append(java_node)
+		protoc_flags.append('--java_out=%s' % node.parent.get_bld().bldpath())
+
+		# Make javac get also pick java code generated in build
+		if not node.parent.get_bld() in self.javac_task.srcdir:
+			self.javac_task.srcdir.append(node.parent.get_bld())
+
+	if not out_nodes:
+		raise Errors.WafError('Feature %r not supported by protoc extra' % self.features)
+
+	tsk = self.create_task('protoc', node, out_nodes)
+	tsk.env.append_value('PROTOC_FLAGS', protoc_flags)
+
+	if 'javac' in self.features:
+		self.javac_task.set_run_after(tsk)
+
+	# Instruct protoc where to search for .proto included files.
+	# For C++ standard include files dirs are used,
+	# but this doesn't apply to Python for example
+	for incpath in getattr(self, 'protoc_includes', []):
+		incdirs.append(self.path.find_node(incpath).bldpath())
+	tsk.env.PROTOC_INCPATHS = incdirs
+
+	# PR2115: protoc generates output of .proto files in nested
+	# directories  by canonicalizing paths. To avoid this we have to pass
+	# as first include the full directory file of the .proto file
+	tsk.env.prepend_value('INCPATHS', node.parent.bldpath())
+
+	use = getattr(self, 'use', '')
+	if not 'PROTOBUF' in use:
+		self.use = self.to_list(use) + ['PROTOBUF']
+
+def configure(conf):
+	conf.check_cfg(package='protobuf', uselib_store='PROTOBUF', args=['--cflags', '--libs'])
+	conf.find_program('protoc', var='PROTOC')
+	conf.start_msg('Checking for protoc version')
+	protocver = conf.cmd_and_log(conf.env.PROTOC + ['--version'], output=Context.BOTH)
+	protocver = ''.join(protocver).strip()[protocver[0].rfind(' ')+1:]
+	conf.end_msg(protocver)
+	conf.env.PROTOC_MAJOR = protocver[:protocver.find('.')]
+	conf.env.PROTOC_ST = '-I%s'
+	conf.env.PROTOC_FL = '%s'