SF patch #474590 -- RISC OS support
diff --git a/Lib/test/test_mhlib.py b/Lib/test/test_mhlib.py
index 9d5f101..91c1a1a 100644
--- a/Lib/test/test_mhlib.py
+++ b/Lib/test/test_mhlib.py
@@ -12,8 +12,8 @@
 import sys
 import mhlib
 
-if sys.platform.startswith("win"):
-    raise TestSkipped("test_mhlib skipped on Windows -- "
+if sys.platform.startswith("win") or sys.platform=="riscos":
+    raise TestSkipped("test_mhlib skipped on %s -- "%sys.platform +
                       "too many Unix assumptions")
 
 _mhroot = TESTFN+"_MH"