Index: head/sysutils/opencorsairlink/Makefile
===================================================================
--- head/sysutils/opencorsairlink/Makefile	(revision 516978)
+++ head/sysutils/opencorsairlink/Makefile	(revision 516979)
@@ -1,27 +1,29 @@
 # $FreeBSD$
 
 PORTNAME=	OpenCorsairLink
 DISTVERSION=	g20191001
 CATEGORIES=	sysutils
 
 MAINTAINER=	lifanov@FreeBSD.org
 COMMENT=	Support for CorsairLink Devices
 
 LICENSE=	GPLv2
 LICENSE_FILE=	${WRKSRC}/LICENSE
 
 USES=	gmake pkgconfig
 
 USE_GITHUB=	yes
 GH_ACCOUNT=	audiohacked
 GH_TAGNAME=	4234f4f
 
 PLIST_FILES=	bin/${PORTNAME}
 
+LDFLAGS+=	-lm
+
 MAKE_ENV=	GIT_VERSION=${GH_TAGNAME}
 
 post-stage:
 	${MV} ${STAGEDIR}${PREFIX}/bin/${PORTNAME}.elf ${STAGEDIR}${PREFIX}/bin/${PORTNAME}
 	${STRIP_CMD} ${STAGEDIR}${PREFIX}/bin/${PORTNAME}
 
 .include <bsd.port.mk>