sadly python's build system is so awful it needs patching to find internal zlib

--- python3/setup.py	2013-05-08 13:42:03.826304937 +0200
+++ python3/setup.py	2013-05-08 13:57:53.027231320 +0200
@@ -1332,7 +1332,11 @@
         #
         # You can upgrade zlib to version 1.1.4 yourself by going to
         # http://www.gzip.org/zlib/
-        zlib_inc = find_file('zlib.h', [], inc_dirs)
+        if os.environ.get('SYSTEM_ZLIB') == 'NO':
+            zlib_incdir = os.environ.get('WORKDIR') + '/' + '/UnpackedTarball/zlib/'
+            zlib_inc = find_file('zlib.h', inc_dirs, [zlib_incdir])
+        else:
+            zlib_inc = find_file('zlib.h', [], inc_dirs)
         have_zlib = False
         if zlib_inc is not None:
             zlib_h = zlib_inc[0] + '/zlib.h'
@@ -1347,13 +1351,23 @@
                         version = line.split()[2]
                         break
             if version >= version_req:
-                if (self.compiler.find_library_file(lib_dirs, 'z')):
+                if os.environ.get('SYSTEM_ZLIB') == 'NO':
+                    zlib_lib = 'zlib'
+                    zlib_libdir = os.environ.get('OUTDIR') + '/' + 'lib'
+#                    zlib_found = find_library_file(self.compiler, zlib_lib, lib_dirs, [zlib_libdir])
+                    zlib_found = [zlib_libdir]
+                else:
+                    zlib_lib = 'z'
+                    zlib_found = self.compiler.find_library_file(lib_dirs, zlib_lib)
+                if zlib_found:
                     if host_platform == "darwin":
                         zlib_extra_link_args = ('-Wl,-search_paths_first',)
                     else:
                         zlib_extra_link_args = ()
                     exts.append( Extension('zlib', ['zlibmodule.c'],
-                                           libraries = ['z'],
+                                           libraries = [zlib_lib],
+                                           include_dirs = zlib_inc,
+                                           library_dirs = zlib_found,
                                            extra_link_args = zlib_extra_link_args))
                     have_zlib = True
                 else: