Index: Makefile
===================================================================
--- Makefile	(revision 526261)
+++ Makefile	(working copy)
@@ -19,9 +19,12 @@
 		libffi.so:devel/libffi \
 		libicudata.so:devel/icu
 
-HAS_CONFIGURE=	yes
 USES=		compiler:c++14-lang gmake localbase pathfix pkgconfig \
 		python:2.7,build tar:xz
+
+OPTIONS_DEFINE=		READLINE
+
+HAS_CONFIGURE=	yes
 USE_LDCONFIG=	yes
 SP_VER=		60
 
@@ -42,11 +45,15 @@
 		--with-system-icu \
 		--with-system-nspr \
 		--enable-shared-js \
-		--enable-optimize \
-		--enable-readline
+		--enable-optimize
 
 CONFIGURE_ENV=	HOST_CC=${CC} HOST_CXX=${CXX}
 
+READLINE_CONFIGURE_ENABLE=	readline
+READLINE_DESC=			Command line editing via GPL'd libreadline port (disable to use bundled editline, zlib license)
+READLINE_USES=			readline
+READLINE_VARS=			LICENSE+=GPLv3
+
 .include <bsd.port.pre.mk>
 
 .if ${ARCH} == amd64