math.h

#include <openlibm_math.h>

// Included to fix mesa issues
#ifndef M_PI
#define	M_PI		3.14159265358979323846	/* pi */
#endif

#ifndef M_PI_2
#define	M_PI_2		1.57079632679489661923	/* pi/2 */
#endif

#ifndef M_PI_4
#define	M_PI_4		0.78539816339744830962	/* pi/4 */
#endif