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-rw-r--r--src/server/collision/BoundingIntervalHierarchy.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/src/server/collision/BoundingIntervalHierarchy.h b/src/server/collision/BoundingIntervalHierarchy.h
index 509eb3d2488..27b65957c47 100644
--- a/src/server/collision/BoundingIntervalHierarchy.h
+++ b/src/server/collision/BoundingIntervalHierarchy.h
@@ -31,6 +31,10 @@
#include <limits>
#include <cmath>
+#ifdef __APPLE__
+ #define isnan(x) ( std::isnan(x) )
+#endif
+
#define MAX_STACK_SIZE 64
#ifdef _MSC_VER