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-rw-r--r--progs/glsl/skinning.c3
-rw-r--r--progs/glsl/texaaline.c3
-rw-r--r--progs/glsl/twoside.c3
3 files changed, 9 insertions, 0 deletions
diff --git a/progs/glsl/skinning.c b/progs/glsl/skinning.c
index 65ba98348b..2b96f31d06 100644
--- a/progs/glsl/skinning.c
+++ b/progs/glsl/skinning.c
@@ -16,6 +16,9 @@
#include <GL/glut.h>
#include "shaderutil.h"
+#ifndef M_PI
+#define M_PI 3.1415926535
+#endif
static char *FragProgFile = "skinning.frag";
static char *VertProgFile = "skinning.vert";
diff --git a/progs/glsl/texaaline.c b/progs/glsl/texaaline.c
index 7a5ac405bb..2e4f932ad6 100644
--- a/progs/glsl/texaaline.c
+++ b/progs/glsl/texaaline.c
@@ -14,6 +14,9 @@
#include <GL/glew.h>
#include <GL/glut.h>
+#ifndef M_PI
+#define M_PI 3.1415926535
+#endif
static GLint WinWidth = 300, WinHeight = 300;
static GLint win = 0;
diff --git a/progs/glsl/twoside.c b/progs/glsl/twoside.c
index a57484f96c..ce155d64e9 100644
--- a/progs/glsl/twoside.c
+++ b/progs/glsl/twoside.c
@@ -16,6 +16,9 @@
#include <GL/glut.h>
#include "shaderutil.h"
+#ifndef M_PI
+#define M_PI 3.1415926535
+#endif
static GLint WinWidth = 300, WinHeight = 300;
static char *FragProgFile = NULL;