Index: dns/unbound/Makefile
===================================================================
--- dns/unbound/Makefile	(revision 316532)
+++ dns/unbound/Makefile	(working copy)
@@ -45,10 +45,15 @@ PORTDOCS=	CREDITS Changelog FEATURES LICENSE READM
 		ietf67-design-02.pdf requirements.txt
 PLIST_SUB+=	PYTHON=${PYTHON} MUNIN=${MUNIN}
 
-OPTIONS_DEFINE=	LIBEVENT THREADS PYTHON GOST ECDSA MUNIN
+OPTIONS_DEFINE=	THREADS PYTHON GOST ECDSA MUNIN
 OPTIONS_DEFAULT=THREADS ECDSA
 
+OPTIONS_RADIO=	LIBEVENT
+OPTIONS_RADIO_LIBEVENT= LIBEVENT14 LIBEVENT20
+
 LIBEVENT_DESC=	Enable whenever using many (10000) outgoing ports
+LIBEVENT14_DESC=Build against libevent-1.4 (devel/libevent)
+LIBEVENT20_DESC=Build against libevent-2.0 (devel/libevent2)
 GOST_DESC=	Enable GOST support (requires OpenSSL from ports)
 ECDSA_DESC=	Enable ECDSA (elliptic curve) support
 MUNIN_DESC=	Install Munin plugin
@@ -90,9 +99,16 @@ MUNIN=
 MUNIN=		"@comment "
 .endif
 
-.if ${PORT_OPTIONS:MLIBEVENT}
+.if ${PORT_OPTIONS:MLIBEVENT14}
 LIB_DEPENDS+=	event-1:${PORTSDIR}/devel/libevent
 CONFIGURE_ARGS+=--with-libevent=${LOCALBASE}
+.elif ${PORT_OPTIONS:MLIBEVENT20}
+LIB_DEPENDS+=	event-2:${PORTSDIR}/devel/libevent2
+USES+=		pkgconfig
+CONFIGURE_ARGS+=--with-libevent=${NONEXISTENT}
+CONFIGURE_ENV+=	found_libevent=yes
+CPPFLAGS+=	$$(pkg-config libevent --cflags-only-I)
+LDFLAGS+=	$$(pkg-config libevent --libs-only-L)
 .else
 CONFIGURE_ARGS+=--with-libevent=no
 .endif