diff --git a/math/gismo/Makefile b/math/gismo/Makefile
index 835a30c2407b..8e475658d7fc 100644
--- a/math/gismo/Makefile
+++ b/math/gismo/Makefile
@@ -1,30 +1,32 @@
 PORTNAME=	gismo
 DISTVERSIONPREFIX=	v
 DISTVERSION=	21.12.0
 CATEGORIES=	math # geometry
 
 MAINTAINER=	yuri@FreeBSD.org
 COMMENT=	C++ library for isogeometric analysis (IGA)
 
 LICENSE=	MPL20
 LICENSE_FILE=	${WRKSRC}/LICENSE.txt
 
+BROKEN_armv7=	unknown target architecture: "generic".  Please set TARGET_ARCHITECTURE to a supported value, see https://github.com/gismo/gismo/issues/541
+
 USES=		cmake:testing compiler:c++14-lang
 USE_GITHUB=	yes
 USE_GCC=	yes # clang-11 crashes: https://bugs.llvm.org/show_bug.cgi?id=51468
 USE_LDCONFIG=	yes
 
 CMAKE_TESTING_ON=	GISMO_BUILD_UNITTESTS # one test is known to fail: https://github.com/gismo/gismo/issues/466
 
 GH_TUPLE=	gismo:gsElasticity:a94347d:gsElasticity/extensions/gsElasticity \
 		gismo:gsKLShell:5247352:gsKLShell/extensions/gsKLShell \
 		gismo:gsStructuralAnalysis:f18c4b7:gsStructuralAnalysis/extensions/gsStructuralAnalysis \
 		gismo:gsUnitTest:7c42e58:gsUnitTest/extensions/gsUnitTest
 
 .include <bsd.port.pre.mk>
 
 .if ${ARCH} == aarch64
 CMAKE_ARGS+=	-DTARGET_ARCHITECTURE="cortex-a53"
 .endif
 
 .include <bsd.port.post.mk>