diff --git a/math/muparser/Makefile b/math/muparser/Makefile
index 52285e44da55..78a47fe7804b 100644
--- a/math/muparser/Makefile
+++ b/math/muparser/Makefile
@@ -1,37 +1,33 @@
 # Created by: Nicola Vitale	<nivit@email.it>
 
 PORTNAME=	muparser
 PORTVERSION=	2.3.2
 DISTVERSIONPREFIX=	v
 CATEGORIES=	math devel
 
 MAINTAINER=	nivit@FreeBSD.org
 COMMENT=	Mathematical expressions parser library written in C++
 
 LICENSE=	BSD2CLAUSE
 LICENSE_FILE=	${WRKSRC}/License.txt
 
-USES=		cmake
+USES=		cmake compiler:c++11-lang
 USE_LDCONFIG=	yes
 
 USE_GITHUB=	yes
 GH_ACCOUNT=	beltoforion
 
 OPTIONS_DEFINE=		EXAMPLES
 
 CMAKE_OFF=	ENABLE_SAMPLES
 
 EXAMPLES_PORTEXAMPLES=	*
 
-.include <bsd.port.options.mk>
-
-.if ${ARCH} == armv7 || ${ARCH} == powerpc
-USES+=		compiler:gcc-c++11-lib
-.else
-USES+=		compiler:c++11-lang
+.if !exists(/usr/include/omp.h)
+CMAKE_ARGS+=	-DENABLE_OPENMP:BOOL=OFF
 .endif
 
 post-install-EXAMPLES-on:
 	cd ${WRKSRC} && ${COPYTREE_SHARE} samples ${STAGEDIR}${EXAMPLESDIR}
 
 .include <bsd.port.mk>