AlmostEqualUlps on central place

src/include/missing_math.h

@@ -5,6 +5,10 @@ Copyright 1999 Emmanuel Rouat
 
 /* Decl. for missing maths functions, if any */
 
+#ifndef MISSING_MATH_H_INCLUDED
+#define MISSING_MATH_H_INCLUDED
+
+bool AlmostEqualUlps(float, float, int);
 
 #ifndef HAVE_ERFC
 extern double erfc(double);
@@ -23,3 +27,5 @@ extern double scalb(double, int);
 #ifndef HAVE_ISNAN
 extern int isnan(double);
 #endif
+
+#endif /* MISSING_MATH_H_INCLUDED */