Patch to fix broken build.

Signed-off-by: Paul Beckingham <paul@beckingham.net>

src/columns/ColUDA.cpp

@@ -33,6 +33,7 @@
 #include <ColUDA.h>
 #include <text.h>
 #include <i18n.h>
+#include <stdlib.h>
 
 extern Context context;