$OpenBSD$
--- src/libs/learning/policy.cpp.orig	Mon Oct 11 12:29:43 2010
+++ src/libs/learning/policy.cpp	Mon Oct 11 12:31:20 2010
@@ -18,6 +18,9 @@
 #ifdef WIN32
 #include <float.h>
 #define isnan _isnan
+#else 
+#include <math.h>
+#define isnan __isnanf
 #endif // WIN32
 
 #undef POLICY_LOG