diff --git a/astro/phd2/Makefile b/astro/phd2/Makefile
index 737ed3235a42..14808df8db10 100644
--- a/astro/phd2/Makefile
+++ b/astro/phd2/Makefile
@@ -1,34 +1,40 @@
 PORTNAME=	phd2
 DISTVERSIONPREFIX=v
 DISTVERSION=	2.6.9dev5
 PORTREVISION=	1
 CATEGORIES=	astro
 
 MAINTAINER=	acm@FreeBSD.org
 COMMENT=	Guiding software inspired by Stark Labs PHD Guiding
 
 LICENSE=	BSD3CLAUSE
 
 LIB_DEPENDS=	libcfitsio.so:astro/cfitsio \
 		libgmock.so:devel/googletest \
 		libindidriver.so:devel/indi \
 		libcurl.so:ftp/curl
 RUN_DEPENDS=	indiserver:devel/indi
 
 USES=		cmake eigen:3 gettext ninja pkgconfig xorg
 
 USE_GITHUB=	yes
 GH_ACCOUNT=	OpenPHDGuiding
 
 USE_WX=		3.1+
 USE_XORG=	x11
 
 WX_COMPS=	wx
 
 CMAKE_ARGS+=	-DUSE_SYSTEM_GTEST:BOOL=YES \
 		-DUSE_SYSTEM_CFITSIO:BOOL=YES \
 		-DUSE_SYSTEM_LIBUSB:BOOL=YES \
 		-DUSE_SYSTEM_LIBINDI:BOOL=YES \
 		-DUSE_SYSTEM_EIGEN3:BOOL=YES
 
+.include <bsd.port.options.mk>
+
+.if ${ARCH} != aarch64 && ${ARCH} != armv6 && ${ARCH} != armv7 && ${ARCH} != amd64 && ${ARCH} != i386
+CMAKE_ARGS+=	-DOPENSOURCE_ONLY:BOOL=YES
+.endif
+
 .include <bsd.port.mk>