message: create directory
diff: @@ -492,6 +492,8 @@ def full_build_and_test_of_tpls(builds_dir, timestamp, spec, report_to_stdout =
  if not os.path.exists(prefix):
  os.mkdir(prefix)
  prefix = pjoin(prefix, timestamp)
  + if not os.path.exists(prefix):
  + os.mkdir(prefix)
  # create a mirror
  uberenv_create_mirror(prefix, spec, "", mirror_dir)
  