Raise 'TestSkipped' (from the test_support) module rather than 'ImportError'
to signify a test that should be marked as 'skipped' rather than 'failed'.
Also 'document' it, in README.
diff --git a/Lib/test/test_dl.py b/Lib/test/test_dl.py
index 53c98e6..60a5cf0 100755
--- a/Lib/test/test_dl.py
+++ b/Lib/test/test_dl.py
@@ -4,7 +4,7 @@
 """
 
 import dl
-from test_support import verbose
+from test_support import verbose,TestSkipped
 
 sharedlibs = [
     ('/usr/lib/libc.so', 'getpid'),
@@ -29,4 +29,4 @@
             print 'worked!'
         break
 else:
-    raise ImportError, 'Could not open any shared libraries'
+    raise TestSkipped, 'Could not open any shared libraries'