MNT: Don't assume any namespaces are included by external header files

siena_diff.cc

@@ -11,12 +11,16 @@
 // }}}
 // {{{ includes and options
 
-#define _GNU_SOURCE 1
-#define POSIX_SOURCE 1
 
-#include "newimage/newimageall.h"
+#include <iostream>
+#include <string>
+
+#include "armawrap/newmat.h"
 #include "miscmaths/miscmaths.h"
+#include "newimage/newimageall.h"
 
+using namespace std;
+using namespace NEWMAT;
 using namespace MISCMATHS;
 using namespace NEWIMAGE;