Doesn't compile due to lack of RTLD_GLOBAL

I'm compiling on HP-UX 10.20 with the hp_dlfcn compatibility package installed.
There is no RTLD_GLOBAL in dlfcn.h, so libao doesn't build.  I patched around it
like this:

--- src/ao_private.h    2001/12/17 14:06:50     1.6
+++ src/ao_private.h    2002/01/16 15:30:33
@@ -42,7 +42,7 @@
  *
  * ALSA requires RTLD_GLOBAL.
  */
-#if defined(__OpenBSD__)       
+#if defined(__OpenBSD__) || defined(hpux)
 #define DLOPEN_FLAG (RTLD_LAZY)
 #else
 #define DLOPEN_FLAG (RTLD_NOW | RTLD_GLOBAL)


but that's a sloppy way to do it; it should be handled by autoconf.