diff --git a/net-mgmt/ipfixcol2/Makefile b/net-mgmt/ipfixcol2/Makefile
index bafe96743955..08b01f0b557d 100644
--- a/net-mgmt/ipfixcol2/Makefile
+++ b/net-mgmt/ipfixcol2/Makefile
@@ -1,46 +1,48 @@
 PORTNAME=	ipfixcol2
 DISTVERSIONPREFIX=	v
 DISTVERSION=	2.8.0
 CATEGORIES=	net-mgmt
 
 MAINTAINER=	zarychtam@plan-b.pwste.edu.pl
 COMMENT=	NetFlow v5/v9 and IPFIX flow (RFC 7011) data collector
 WWW=		https://github.com/CESNET/ipfixcol2
 
 LICENSE=	GPLv2
 LICENSE_FILE=	${WRKSRC}/LICENSE
 
+BROKEN_FreeBSD_13=	Requires sys/timerfd.h
+
 ONLY_FOR_ARCHS=		aarch64 amd64
-ONLY_FOR_ARCHS_REASON=	Require SSE2 and static_assert(sizeof(uint64_t) == sizeof(time_t), "Assumed that time_t is uint64_t, but it's not")
+ONLY_FOR_ARCHS_REASON=	Requires 64bit time_t: static_assert(sizeof(uint64_t) == sizeof(time_t), "Assumed that time_t is uint64_t, but it's not")
 
 BUILD_DEPENDS=	rst2man:textproc/py-docutils
 LIB_DEPENDS=	libepoll-shim.so:devel/libepoll-shim \
 		libfds.so:net-mgmt/libfds \
 		liblz4.so:archivers/liblz4 \
 		librdkafka.so:net/librdkafka
 
 USES=		cmake:testing localbase:ldflags pkgconfig
 USE_GITHUB=	yes
 GH_ACCOUNT=	CESNET
 USE_RC_SUBR=	${PORTNAME}
 
 CXXFLAGS+=	-D_GNU_SOURCE
 LDFLAGS+=	-rdynamic
 
 SUB_LIST=	USER=${USERS:[0]}
 USERS=		${PORTNAME}
 GROUPS=		${PORTNAME}
 PORTEXAMPLES=	*
 
 OPTIONS_DEFINE=	EXAMPLES
 
 post-install:
 	${MKDIR} ${STAGEDIR}${ETCDIR} ${STAGEDIR}/var/run/${PORTNAME}
 	${INSTALL_DATA} ${WRKSRC}/doc/data/configs/udp2json.xml \
 		${STAGEDIR}${ETCDIR}/startup.xml.sample
 
 post-install-EXAMPLES-on:
 	(cd ${WRKSRC}/doc/data && ${COPYTREE_SHARE} "configs" \
 		${STAGEDIR}${EXAMPLESDIR})
 
 .include <bsd.port.mk>