diff -up torcs-1.3.7/src/drivers/olethros/geometry.cpp.orig torcs-1.3.7/src/drivers/olethros/geometry.cpp
--- torcs-1.3.7/src/drivers/olethros/geometry.cpp.orig	2016-06-07 19:49:11.347896827 +0100
+++ torcs-1.3.7/src/drivers/olethros/geometry.cpp	2016-06-07 19:49:46.532894257 +0100
@@ -27,6 +27,8 @@
 #ifdef WIN32
 #include <float.h>
 #define isnan _isnan
+#else
+#define isnan std::isnan
 #endif