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diff --git a/extras/make.py b/extras/make.py
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+++ b/extras/make.py
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+#!/usr/bin/env python
+# encoding: utf-8
+# Thomas Nagy, 2011 (ita)
+
+"""
+A make-like way of executing the build, following the relationships between inputs/outputs
+
+This algorithm will lead to slower builds, will not be as flexible as "waf build", but
+it might be useful for building data files (?)
+
+It is likely to break in the following cases:
+- files are created dynamically (no inputs or outputs)
+- headers
+- building two files from different groups
+"""
+
+import re
+from waflib import Options, Task
+from waflib.Build import BuildContext
+
+class MakeContext(BuildContext):
+	'''executes tasks in a step-by-step manner, following dependencies between inputs/outputs'''
+	cmd = 'make'
+	fun = 'build'
+
+	def __init__(self, **kw):
+		super(MakeContext, self).__init__(**kw)
+		self.files = Options.options.files
+
+	def get_build_iterator(self):
+		if not self.files:
+			while 1:
+				yield super(MakeContext, self).get_build_iterator()
+
+		for g in self.groups:
+			for tg in g:
+				try:
+					f = tg.post
+				except AttributeError:
+					pass
+				else:
+					f()
+
+			provides = {}
+			uses = {}
+			all_tasks = []
+			tasks = []
+			for pat in self.files.split(','):
+				matcher = self.get_matcher(pat)
+				for tg in g:
+					if isinstance(tg, Task.Task):
+						lst = [tg]
+					else:
+						lst = tg.tasks
+					for tsk in lst:
+						all_tasks.append(tsk)
+
+						do_exec = False
+						for node in tsk.inputs:
+							try:
+								uses[node].append(tsk)
+							except:
+								uses[node] = [tsk]
+
+							if matcher(node, output=False):
+								do_exec = True
+								break
+
+						for node in tsk.outputs:
+							try:
+								provides[node].append(tsk)
+							except:
+								provides[node] = [tsk]
+
+							if matcher(node, output=True):
+								do_exec = True
+								break
+						if do_exec:
+							tasks.append(tsk)
+
+			# so we have the tasks that we need to process, the list of all tasks,
+			# the map of the tasks providing nodes, and the map of tasks using nodes
+
+			if not tasks:
+				# if there are no tasks matching, return everything in the current group
+				result = all_tasks
+			else:
+				# this is like a big filter...
+				result = set()
+				seen = set()
+				cur = set(tasks)
+				while cur:
+					result |= cur
+					tosee = set()
+					for tsk in cur:
+						for node in tsk.inputs:
+							if node in seen:
+								continue
+							seen.add(node)
+							tosee |= set(provides.get(node, []))
+					cur = tosee
+				result = list(result)
+
+			Task.set_file_constraints(result)
+			Task.set_precedence_constraints(result)
+			yield result
+
+		while 1:
+			yield []
+
+	def get_matcher(self, pat):
+		# this returns a function
+		inn = True
+		out = True
+		if pat.startswith('in:'):
+			out = False
+			pat = pat.replace('in:', '')
+		elif pat.startswith('out:'):
+			inn = False
+			pat = pat.replace('out:', '')
+
+		anode = self.root.find_node(pat)
+		pattern = None
+		if not anode:
+			if not pat.startswith('^'):
+				pat = '^.+?%s' % pat
+			if not pat.endswith('$'):
+				pat = '%s$' % pat
+			pattern = re.compile(pat)
+
+		def match(node, output):
+			if output and not out:
+				return False
+			if not output and not inn:
+				return False
+
+			if anode:
+				return anode == node
+			else:
+				return pattern.match(node.abspath())
+		return match
+