--- a/src/zc/buildout/easy_install.py	2013-08-27 22:28:40.233718116 +0200
+++ b/src/zc/buildout/easy_install.py	2013-08-27 22:31:07.967871186 +0200
@@ -508,16 +508,15 @@
                         self._dest, os.path.basename(dist.location))
 
                     if os.path.isdir(dist.location):
-                        # we got a directory. It must have been
-                        # obtained locally.  Just copy it.
-                        shutil.copytree(dist.location, newloc)
+                        # Symlink to dists in /nix/store
+                        if not os.path.exists(newloc):
+                            os.symlink(dist.location, newloc)
                     else:
 
 
                         setuptools.archive_util.unpack_archive(
                             dist.location, newloc)
-
-                    redo_pyc(newloc)
+                        redo_pyc(newloc)
 
                     # Getting the dist from the environment causes the
                     # distribution meta data to be read.  Cloning isn't