$OpenBSD$
--- src/drivers/olethros/geometry.cpp.orig	Mon Oct 11 13:39:29 2010
+++ src/drivers/olethros/geometry.cpp	Mon Oct 11 13:40:07 2010
@@ -27,6 +27,9 @@
 #ifdef WIN32
 #include <float.h>
 #define isnan _isnan
+#else
+#include <math.h>
+#define isnan __isnanf
 #endif