diff --git a/src/analyzer.cpp b/src/analyzer.cpp
index 83e36e7c6..34f3bc60d 100644
--- a/src/analyzer.cpp
+++ b/src/analyzer.cpp
@@ -35,6 +35,11 @@ using namespace calf_plugins;
 #define sinc(x) (x == 0) ? 1 : sin(M_PI * x)/(M_PI * x);
 #define RGBAtoINT(r, g, b, a) ((uint32_t)(r * 255) << 24) + ((uint32_t)(g * 255) << 16) + ((uint32_t)(b * 255) << 8) + (uint32_t)(a * 255)
 
+#ifndef M_PI 
+#define M_PI 3.14159265358979323846264338327 
+#endif 
+
+
 analyzer::analyzer() {
     _accuracy       = -1;
     _acc            = -1;
diff --git a/src/audio_fx.cpp b/src/audio_fx.cpp
index 5933e21f7..712ef0001 100644
--- a/src/audio_fx.cpp
+++ b/src/audio_fx.cpp
@@ -29,6 +29,14 @@
 using namespace calf_plugins;
 using namespace dsp;
 
+#ifndef M_PI 
+#define M_PI 3.14159265358979323846264338327 
+#endif 
+
+#ifndef M_PI_2
+# define M_PI_2		1.57079632679489661923	/* pi/2 */
+#endif
+
 simple_phaser::simple_phaser(int _max_stages, float *x1vals, float *y1vals)
 {
     max_stages = _max_stages;
diff --git a/src/calf/biquad.h b/src/calf/biquad.h
index 95c4a39ca..28ca20e5b 100644
--- a/src/calf/biquad.h
+++ b/src/calf/biquad.h
@@ -26,6 +26,10 @@
 #include <complex>
 #include "primitives.h"
 
+#ifndef M_PI 
+#define M_PI 3.14159265358979323846264338327 
+#endif 
+
 namespace dsp {
 
 /**
diff --git a/src/calf/loudness.h b/src/calf/loudness.h
index 74da4af91..c68cb7607 100644
--- a/src/calf/loudness.h
+++ b/src/calf/loudness.h
@@ -25,6 +25,11 @@
 
 #include "biquad.h"
 
+#ifndef M_PI 
+#define M_PI 3.14159265358979323846264338327 
+#endif 
+
+
 namespace dsp {
     
 class aweighter {
diff --git a/src/calf/primitives.h b/src/calf/primitives.h
index de3245f45..561e40080 100644
--- a/src/calf/primitives.h
+++ b/src/calf/primitives.h
@@ -30,6 +30,11 @@
 #include <map>
 #include <algorithm>
 
+#ifndef M_PI 
+#define M_PI 3.14159265358979323846264338327 
+#endif 
+
+
 namespace dsp {
 
 /// Set a float to zero
diff --git a/src/modules_dist.cpp b/src/modules_dist.cpp
index a6679ca24..bce16a52f 100644
--- a/src/modules_dist.cpp
+++ b/src/modules_dist.cpp
@@ -50,6 +50,10 @@ using namespace calf_plugins;
 
 #define SET_IF_CONNECTED(name) if (params[AM::param_##name] != NULL) *params[AM::param_##name] = name;
 
+#ifndef M_PI 
+#define M_PI 3.14159265358979323846264338327 
+#endif 
+
 /**********************************************************************
  * SATURATOR by Markus Schmidt
 **********************************************************************/
diff --git a/src/veal.cpp b/src/veal.cpp
index fd3b283ff..d3c3913af 100644
--- a/src/veal.cpp
+++ b/src/veal.cpp
@@ -528,7 +528,6 @@ const LV2_Descriptor *lv2_descriptor(uint32_t index)
 
 #if USE_LADSPA
 extern "C" {
-
 const LADSPA_Descriptor *ladspa_descriptor(unsigned long Index)
 {
     #define PER_MODULE_ITEM(name, isSynth, jackname) if (!isSynth && !(Index--)) return &ladspa_wrapper<name##_audio_module>::get().descriptor;