diff --git a/math/octave-forge-interval/Makefile b/math/octave-forge-interval/Makefile
index 8a6bc0b70d26..b9be5da73ac8 100644
--- a/math/octave-forge-interval/Makefile
+++ b/math/octave-forge-interval/Makefile
@@ -1,19 +1,26 @@
 PORTNAME=	octave-forge-interval
 PORTVERSION=	3.2.1
 PORTREVISION=	3
 CATEGORIES=	math
 MASTER_SITES=	SF/octave/Octave%20Forge%20Packages/Individual%20Package%20Releases
 DISTNAME=	${OCTAVE_PKGNAME}-${DISTVERSIONFULL}
 
 MAINTAINER=	stephen@FreeBSD.org
 COMMENT=	Octave-forge package ${OCTAVE_PKGNAME}
 WWW=		https://packages.octave.org/
 
 LICENSE=	GPLv3
 LICENSE_FILE=	${WRKDIR}/${OCTAVE_SRC}/COPYING
 
 LIB_DEPENDS=	libmpfr.so:math/mpfr
 
 USES=		octave
 
+.include <bsd.port.options.mk>
+
+.if ${ARCH:Mpowerpc*}
+CXX=		clang++${LLVM_VERSION}
+USES+=		llvm:min=16
+.endif
+
 .include <bsd.port.mk>