diff --git a/cad/ngspice_rework/Makefile b/cad/ngspice_rework/Makefile
index c6578e56c7d5..9fc32a5f2ba8 100644
--- a/cad/ngspice_rework/Makefile
+++ b/cad/ngspice_rework/Makefile
@@ -1,27 +1,33 @@
 # New ports collection makefile for:	ngspice_rework
 # Date created:		2002-01-02
 # Whom:			AMAKAWA Shuhei <amakawa@jp.FreeBSD.org>
 #
 # $FreeBSD$
 #
 
 PORTNAME=	ngspice_rework
 PORTVERSION=	15
 CATEGORIES=	cad
 MASTER_SITES=	${MASTER_SITE_SOURCEFORGE}
 MASTER_SITE_SUBDIR=	ngspice
 DISTNAME=	ngspice-rework${PORTVERSION}
 EXTRACT_SUFX=	.tgz
 
 MAINTAINER=	amakawa@jp.FreeBSD.org
 COMMENT=	A circuit simulator derived from spice3f5
 
 WRKSRC=		${WRKDIR}/ng-spice-rework-${PORTVERSION}
 GNU_CONFIGURE=	yes
 USE_LIBTOOL_VER?=15
 USE_GMAKE=	yes
 
+.ifndef PACKAGE_BUILDING
+CONFIGURE_ARGS+=	--with-readline=yes
+.else
+CONFIGURE_ARGS+=	--disable-debug
+.endif
+
 INFO=		ngspice
 MAN1=		ngspice.1 ngnutmeg.1 ngsconvert.1
 
 .include <bsd.port.mk>