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