Enforced rotation

[alexxy/gromacs.git] / include / maths.h

diff --git a/include/maths.h b/include/maths.h
index 782e7688f10b6c7c03b5a8191840aea99f710365..f4a998e042d09bc93244b7aad043018dc5e06c30 100644 (file)
--- a/include/maths.h
+++ b/include/maths.h
@@ -60,6 +60,10 @@ extern "C" {
 #ifndef M_SQRT2
 #define M_SQRT2 sqrt(2.0)
 #endif
+
+#ifndef M_1_PI
+#define M_1_PI      0.31830988618379067154
+#endif
     
 /* Suzuki-Yoshida Constants, for n=3 and n=5, for symplectic integration  */
 /* for n=1, w0 = 1 */