diff --git a/cad/qucs-s/Makefile b/cad/qucs-s/Makefile
index b55be84a0e8c..a35348c2cede 100644
--- a/cad/qucs-s/Makefile
+++ b/cad/qucs-s/Makefile
@@ -1,41 +1,47 @@
 PORTNAME=	qucs-s
 DISTVERSION=	0.0.24
-PORTREVISION=	3
+PORTREVISION=	4
 CATEGORIES=	cad
 
 MAINTAINER=	yuri@FreeBSD.org
 COMMENT=	Quite Universal Circuit Simulator: GUI for circuit simulation kernels
 
 LICENSE=	GPLv2
 LICENSE_FILE=	${WRKSRC}/COPYING
 
-RUN_DEPENDS=	octave:math/octave
-
 USES=		cmake qt:5
 USE_QT=		core gui printsupport svg widgets buildtools_build linguisttools_build qmake_build
 
 USE_GITHUB=	yes
 GH_ACCOUNT=	ra3xdh
 GH_PROJECT=	qucs_s
 
-OPTIONS_GROUP=		BACKENDS
+OPTIONS_GROUP=		BACKENDS RTDEPENDS
 OPTIONS_GROUP_BACKENDS=	NGSPICE XYCE QUCSATOR
+OPTIONS_GROUP_RTDEPENDS=	OCTAVE ADMS
 OPTIONS_DEFAULT=	NGSPICE
 
 BACKENDS_DESC=		Simulation backends
+RTDEPENDS_DESC=		Optional run-time dependencies
 
 NGSPICE_DESC=		ngspice mixed-signal circuit simulator
 NGSPICE_RUN_DEPENDS=	ngspice:cad/ngspice_rework
 
 XYCE_DESC=		Xyce electronic simulator
 XYCE_RUN_DEPENDS=	Xyce:cad/xyce \
 			mpich>0:net/mpich # mpich for the mpirun executable
 
 QUCSATOR_DESC=		Circuit simulator of the Qucs project
 QUCSATOR_RUN_DEPENDS=	qucsator:cad/qucsator
 
+OCTAVE_DESC=		Octave is used for some non-essential features
+OCTAVE_RUN_DEPENDS=	octave:math/octave
+
+ADMS_DESC=		ADMS model generator used for some non-essential features
+ADMS_RUN_DEPENDS=	admsXml:cad/adms
+
 post-patch:
 	# first the patch under files/ introduces %%PREFIX%%, and now we fix it here
 	@${REINPLACE_CMD} -e 's|%%PREFIX%%|${PREFIX}|' ${WRKSRC}/qucs/main.cpp
 
 .include <bsd.port.mk>