Index: head/devel/aws-c-event-stream/Makefile
===================================================================
--- head/devel/aws-c-event-stream/Makefile	(revision 487634)
+++ head/devel/aws-c-event-stream/Makefile	(revision 487635)
@@ -1,27 +1,27 @@
 # Created by: Danilo Egea Gondolfo <danilo@FreeBSD.org>
 # $FreeBSD$
 
 PORTNAME=	aws-c-event-stream
 PORTVERSION=	20181214
 CATEGORIES=	devel
 
 MAINTAINER=	danilo@FreeBSD.org
 COMMENT=	C99 implementation of the vnd.amazon.eventstream content-type
 
 LICENSE=	APACHE20
 
 LIB_DEPENDS=	libaws-c-common.so:devel/aws-c-commons \
 		libaws-checksums.so:devel/aws-checksums
 
 USES=		cmake
 
 USE_GITHUB=	yes
 GH_ACCOUNT=	awslabs
 GH_TAGNAME=	46391e3
 
 CMAKE_ARGS+=	-DBUILD_SHARED_LIBS=ON
-LDFLAGS+=	-lexecinfo
+LDFLAGS+=	-lexecinfo -lpthread
 
 USE_LDCONFIG=	yes
 
 .include <bsd.port.mk>