diff --git a/math/gismo/Makefile b/math/gismo/Makefile
index 8580352ed1f9..8780a47584b6 100644
--- a/math/gismo/Makefile
+++ b/math/gismo/Makefile
@@ -1,32 +1,35 @@
 PORTNAME=	gismo
 DISTVERSIONPREFIX=	v
 DISTVERSION=	24.08.0
 CATEGORIES=	math # geometry
 
 MAINTAINER=	yuri@FreeBSD.org
 COMMENT=	C++ library for isogeometric analysis (IGA)
-WWW=		https://gismo.github.io/
+WWW=		https://gismo.github.io/ \
+		https://github.com/gismo/gismo
 
 LICENSE=	MPL20
 LICENSE_FILE=	${WRKSRC}/LICENSE.txt
 
+BROKEN_FreeBSD_15=	compilation is broken with clang-19, see https://github.com/gismo/gismo/issues/741
+
 USES=		cmake:testing compiler:c++14-lang
 USE_GITHUB=	yes
 USE_LDCONFIG=	yes
 
 CMAKE_TESTING_ON=	GISMO_BUILD_UNITTESTS # one test is known to fail: https://github.com/gismo/gismo/issues/466
 
 CXXFLAGS_powerpc64=	-mvsx
 
 .include <bsd.port.pre.mk>
 
 .if ${ARCH} == aarch64
 CMAKE_ARGS+=	-DTARGET_ARCHITECTURE="cortex-a53"
 .elif ${ARCH} == armv6
 # Raspberry Pi 1, the only supported armv6 target
 CMAKE_ARGS+=	-DTARGET_ARCHITECTURE="arm1176jzf-s"
 .elif ${ARCH} == armv7
 CMAKE_ARGS+=	-DTARGET_ARCHITECTURE="cortex-a7"
 .endif
 
 .include <bsd.port.post.mk>