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diff --git a/fdlibm.h b/fdlibm.h
--- a/fdlibm.h
+++ b/fdlibm.h
@@ -9,20 +9,23 @@
* ====================================================
*/
/*
* from: @(#)fdlibm.h 5.1 93/09/24
* $FreeBSD$
*/
-#ifndef _MATH_H_
-#define _MATH_H_
+#ifndef mozilla_imported_fdlibm_h
+#define mozilla_imported_fdlibm_h
+#ifndef M_PI_2
#define M_PI_2 1.57079632679489661923 /* pi/2 */
+#endif
+
double acos(double);
double asin(double);
double atan(double);
double atan2(double, double);
double cos(double);
double sin(double);
double tan(double);
@@ -54,9 +57,9 @@ float tanf(float);
float exp2f(float);
float expf(float);
float log10f(float);
float logf(float);
float powf(float, float);
float hypotf(float, float);
-#endif /* !_MATH_H_ */
+#endif /* !mozilla_imported_fdlibm_h */