diff -ruN dns/dnscap.orig/Makefile dns/dnscap/Makefile
--- dns/dnscap.orig/Makefile	2017-03-20 15:06:55.643899000 +0000
+++ dns/dnscap/Makefile	2017-03-20 15:04:42.494140000 +0000
@@ -14,9 +14,11 @@
 LICENSE=	BSD3CLAUSE
 LICENSE_FILE=	${WRKSRC}/LICENSE
 
-OPTIONS_DEFINE=	DOCS
+OPTIONS_DEFINE= 	DOCS THREADS
+OPTIONS_DEFAULT=	DOCS THREADS
+THREADS_CONFIGURE_ENABLE=threads
 
-CONFIGURE_ARGS=	--enable-shared --enable-static --enable-threads
+CONFIGURE_ARGS=	--enable-shared --enable-static
 GNU_CONFIGURE=	yes
 INSTALL_TARGET=	install-strip
 USES=		libtool