diff --git a/desmume/src/matrix.h b/desmume/src/matrix.h
index 10407d350..a0687691f 100644
--- a/desmume/src/matrix.h
+++ b/desmume/src/matrix.h
@@ -21,6 +21,8 @@
 #ifndef MATRIX_H
 #define MATRIX_H
 
+#include <math.h>
+
 #include "types.h"
 
 extern "C" {
diff --git a/desmume/src/windows/defaultconfig/userconfig.h b/desmume/src/windows/defaultconfig/userconfig.h
index 9ff3d33c9..be8adbedc 100644
--- a/desmume/src/windows/defaultconfig/userconfig.h
+++ b/desmume/src/windows/defaultconfig/userconfig.h
@@ -7,6 +7,7 @@
 
 //#define NOSSE2 //disables SSE2 optimizations (better change it in the vc++ codegen options too)
 //#define DEVELOPER //enables dev+ features
+//#define GDB_STUB //enables the gdb stub. for some reason this is separate from dev+ for now
 
 
 #endif //_USERCONFIG_H