diff --git a/waflib/extras/lru_cache.py b/waflib/extras/lru_cache.py
deleted file mode 100644
index 2bc96442..00000000
--- a/waflib/extras/lru_cache.py
+++ /dev/null
@@ -1,98 +0,0 @@
-#! /usr/bin/env python
-# encoding: utf-8
-# Thomas Nagy 2011
-
-import os, shutil, re
-from waflib import Options, Build, Logs
-
-"""
-Apply a least recently used policy to the Waf cache.
-
-For performance reasons, it is called after the build is complete.
-
-We assume that the the folders are written atomically
-
-Do export WAFCACHE=/tmp/foo_xyz where xyz represents the cache size in bytes
-If missing, the default cache size will be set to 10GB
-"""
-
-re_num = re.compile('[a-zA-Z_-]+(\d+)')
-
-CACHESIZE = 10*1024*1024*1024 # in bytes
-CLEANRATIO = 0.8
-DIRSIZE = 4096
-
-def compile(self):
-	if Options.cache_global and not Options.options.nocache:
-		try:
-			os.makedirs(Options.cache_global)
-		except:
-			pass
-
-	try:
-		self.raw_compile()
-	finally:
-		if Options.cache_global and not Options.options.nocache:
-			self.sweep()
-
-def sweep(self):
-	global CACHESIZE
-	CACHEDIR = Options.cache_global
-
-	# get the cache max size from the WAFCACHE filename
-	re_num = re.compile('[a-zA-Z_]+(\d+)')
-	val = re_num.sub('\\1', os.path.basename(Options.cache_global))
-	try:
-		CACHESIZE = int(val)
-	except:
-		pass
-
-	# map folder names to timestamps
-	flist = {}
-	for x in os.listdir(CACHEDIR):
-		j = os.path.join(CACHEDIR, x)
-		if os.path.isdir(j) and len(x) == 64: # dir names are md5 hexdigests
-			flist[x] = [os.stat(j).st_mtime, 0]
-
-	for (x, v) in flist.items():
-		cnt = DIRSIZE # each entry takes 4kB
-		d = os.path.join(CACHEDIR, x)
-		for k in os.listdir(d):
-			cnt += os.stat(os.path.join(d, k)).st_size
-		flist[x][1] = cnt
-
-	total = sum([x[1] for x in flist.values()])
-	Logs.debug('lru: Cache size is %r' % total)
-
-	if total >= CACHESIZE:
-		Logs.debug('lru: Trimming the cache since %r > %r' % (total, CACHESIZE))
-
-		# make a list to sort the folders by timestamp
-		lst = [(p, v[0], v[1]) for (p, v) in flist.items()]
-		lst.sort(key=lambda x: x[1]) # sort by timestamp
-		lst.reverse()
-
-		while total >= CACHESIZE * CLEANRATIO:
-			(k, t, s) = lst.pop()
-			p = os.path.join(CACHEDIR, k)
-			v = p + '.del'
-			try:
-				os.rename(p, v)
-			except:
-				# someone already did it
-				pass
-			else:
-				try:
-					shutil.rmtree(v)
-				except:
-					# this should not happen, but who knows?
-					Logs.warn('If you ever see this message, report it (%r)' % v)
-			total -= s
-			del flist[k]
-
-	Logs.debug('lru: Total at the end %r' % total)
-
-Build.BuildContext.raw_compile = Build.BuildContext.compile
-Build.BuildContext.compile = compile
-Build.BuildContext.sweep = sweep
-