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--- src/dosbox/src/fpu/fpu_instructions.h	2016-04-22 22:09:06.159430638 -0400
+++ src/dosbox/src/fpu/fpu_instructions.h	2016-04-22 22:09:50.657045747 -0400
@@ -282,6 +282,7 @@ static void FPU_FBST(PhysPt addr) {
 # include <math.h>
 # include <cmath>
 # define isdenormal(x) (!std::isnormal(x))
+# define isinf(x) (std::isinf(x))
 #endif
 
 static void FPU_FADD(Bitu op1, Bitu op2){