Index: sysutils/tmux/Makefile
===================================================================
--- sysutils/tmux/Makefile	(revision 489862)
+++ sysutils/tmux/Makefile	(working copy)
@@ -30,11 +30,17 @@
 PORTDOCS=	CHANGES README TODO
 PORTEXAMPLES=	*
 
-OPTIONS_DEFINE=	DOCS EXAMPLES LIBEVENT_STATIC BACKSPACE
+OPTIONS_DEFINE=	DOCS EXAMPLES LIBEVENT_STATIC BACKSPACE UTF8PROC
+OPTIONS_DEFAULT=	UTF8PROC
 
 LIBEVENT_STATIC_DESC=	Build with static libevent
 BACKSPACE_DESC=	Build with tty/keys patch
+UTF8PROC_DESC=	Build with utf8proc support
 
+UTF8PROC_CONFIGURE_ENABLE=	utf8proc
+
+UTF8PROC_LIB_DEPENDS=	libutf8proc.so:textproc/utf8proc
+
 BACKSPACE_EXTRA_PATCHES=	${PATCHDIR}/extra-patch-tty-keys.c
 
 LIBEVENT_STATIC_LIB_DEPENDS_OFF=	libevent.so:devel/libevent