diff --git a/samplebrain/qt/process_thread.cpp b/samplebrain/qt/process_thread.cpp
index 4044e21..e053514 100644
--- a/samplebrain/qt/process_thread.cpp
+++ b/samplebrain/qt/process_thread.cpp
@@ -19,6 +19,10 @@
 #include <unistd.h>
 #include "status.h"
 
+#ifdef WIN32
+#include <windows.h>
+#endif
+
 using namespace spiralcore;
 using namespace std;
 
@@ -136,7 +140,11 @@ void process_thread::process() {
 	save_session(cmd.get_string(0));
       }
     }
+#ifdef WIN32 
+    Sleep(1);
+#else
     usleep(500);
+#endif 
   }
 }
 
diff --git a/samplebrain/qt/process_thread.h b/samplebrain/qt/process_thread.h
index 39727e6..134dbdd 100644
--- a/samplebrain/qt/process_thread.h
+++ b/samplebrain/qt/process_thread.h
@@ -18,6 +18,7 @@
 #include "brain.h"
 #include "renderer.h"
 #include "block_stream.h"
+#define HAVE_STRUCT_TIMESPEC
 #include <pthread.h>
 
 #pragma once
diff --git a/samplebrain/src/aquila/transform/Dct.cpp b/samplebrain/src/aquila/transform/Dct.cpp
index ac3098f..d89c1a9 100644
--- a/samplebrain/src/aquila/transform/Dct.cpp
+++ b/samplebrain/src/aquila/transform/Dct.cpp
@@ -20,6 +20,10 @@
 #include <cmath>
 #include <iterator>
 
+#ifndef M_PI
+#define M_PI 3.141592653589
+#endif
+
 namespace Aquila
 {
     /**
diff --git a/samplebrain/src/window.cpp b/samplebrain/src/window.cpp
index e038624..f1852c9 100644
--- a/samplebrain/src/window.cpp
+++ b/samplebrain/src/window.cpp
@@ -21,6 +21,10 @@
 using namespace std;
 using namespace spiralcore;
 
+#ifndef M_PI
+#define M_PI 3.141592653589
+#endif
+
 window::window() :
     m_current_type(RECTANGLE)
 {