$OpenBSD$
--- src/drivers/olethros/driver.cpp.orig	Mon Oct 11 13:40:29 2010
+++ src/drivers/olethros/driver.cpp	Mon Oct 11 13:41:04 2010
@@ -41,6 +41,8 @@
 #ifdef WIN32
 #include <float.h>
 #define isnan _isnan
+#else
+#define isnan __isnanf
 #endif
 
 #undef TEST_PITSTOPS