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-rw-r--r--src/projects.h6
1 files changed, 6 insertions, 0 deletions
diff --git a/src/projects.h b/src/projects.h
index 33af9ca7..f64d1a4f 100644
--- a/src/projects.h
+++ b/src/projects.h
@@ -105,6 +105,12 @@ extern double hypot(double, double);
#define M_PI 3.14159265358979310
#define M_PI_2 1.57079632679489660
#define M_PI_4 0.78539816339744828
+#define M_2_PI 0.63661977236758134308
+#endif
+
+/* M_SQRT2 might be missing */
+#ifndef M_SQRT2
+#define M_SQRT2 1.41421356237309504880
#endif
/* some more useful math constants and aliases */