Don't try to build dl on darwin. It doesn't build out of the box, and it
wouldn't serve a useful purpose anyway.
diff --git a/setup.py b/setup.py
index 01b87eb..3217033 100644
--- a/setup.py
+++ b/setup.py
@@ -734,7 +734,7 @@
if sys.maxint == 0x7fffffff:
# This requires sizeof(int) == sizeof(long) == sizeof(char*)
dl_inc = find_file('dlfcn.h', [], inc_dirs)
- if (dl_inc is not None) and (platform not in ['atheos']):
+ if (dl_inc is not None) and (platform not in ['atheos', 'darwin']):
exts.append( Extension('dl', ['dlmodule.c']) )
# Platform-specific libraries