--- ./camel/camel-iconv.c.orig
+++ ./camel/camel-iconv.c
@@ -38,6 +38,10 @@
 #include "camel-iconv.h"
 #include "iconv-detect.h"
 
+#ifndef ICONV_10646
+#define ICONV_10646 "iso-10646"
+#endif /*ICONV_10646*/
+
 #define cd(x)
 
 G_LOCK_DEFINE_STATIC (iconv);