diff --git a/science/gbtolib/Makefile b/science/gbtolib/Makefile
index ec8fcdbf995f..055f95696e3b 100644
--- a/science/gbtolib/Makefile
+++ b/science/gbtolib/Makefile
@@ -1,26 +1,30 @@
 PORTNAME=	gbtolib
 DISTVERSION=	3.0.3
 CATEGORIES=	science # chemistry, physics
 MASTER_SITES=	https://zenodo.org/record/5798035/files/
 DISTNAME=	GBTOLib-${DISTVERSION}
 
 MAINTAINER=	yuri@FreeBSD.org
 COMMENT=	High-performance library for evaluation of molecular integrals
 
 LICENSE=	GPLv3
 LICENSE_FILE=	${WRKSRC}/COPYING
 
+.if !exists(/usr/include/omp.h)
+BROKEN=		requires OpenMP support that is missing on this architecture
+.endif
+
 LIB_DEPENDS=	libopenblas.so:math/openblas
 
 USES=		cmake fortran zip
 
 CMAKE_ON=	BUILD_SHARED_LIBS
 CMAKE_OFF=	BUILD_DOC BUILD_TESTING
 
 OPTIONS_DEFINE=	MPI
 
 MPI_CMAKE_BOOL=	WITH_MPI
 MPI_CMAKE_ON=	-DMPIEXEC_EXECUTABLE=${LOCALBASE}/bin/mpiexec
 MPI_BROKEN=	MPI build fails with error: Failed to detemine MPI integer interface.
 
 .include <bsd.port.mk>