diff --git a/libsigc++20-gcc46.patch b/libsigc++20-gcc46.patch
new file mode 100644
index 0000000..00d7dfd
--- /dev/null
+++ b/libsigc++20-gcc46.patch
@@ -0,0 +1,12 @@
+diff --git a/sigc++/signal_base.h b/sigc++/signal_base.h
+index 1638642..e43bd5e 100644
+--- a/sigc++/signal_base.h
++++ b/sigc++/signal_base.h
+@@ -21,6 +21,7 @@
+ #ifndef _SIGC_SIGNAL_BASE_H_
+ #define _SIGC_SIGNAL_BASE_H_
+ 
++#include <cstddef>
+ #include <list>
+ #include <sigc++config.h>
+ #include <sigc++/type_traits.h>