diff -urN ptlib-2.10.9/src/ptclib/socks.cxx ptlib-2.10.9.new/src/ptclib/socks.cxx
--- ptlib-2.10.9/src/ptclib/socks.cxx	2012-11-26 11:44:52.000000000 +0100
+++ ptlib-2.10.9.new/src/ptclib/socks.cxx	2012-12-11 15:55:41.320940496 +0100
@@ -34,6 +34,8 @@
 
 #include <ptclib/socks.h>
 
+#include <algorithm>
+
 #define new PNEW
 
 #define SOCKS_VERSION_4 ((BYTE)4)