Index: head/net/ntpsec/Makefile
===================================================================
--- head/net/ntpsec/Makefile	(revision 562607)
+++ head/net/ntpsec/Makefile	(revision 562608)
@@ -1,40 +1,44 @@
 # $FreeBSD$
 
 PORTNAME=	ntpsec
 DISTVERSIONPREFIX=	NTPsec_
 DISTVERSION=	1_2_0
-PORTREVISION=	1
+PORTREVISION=	2
 CATEGORIES=	net
 
 MAINTAINER=	yuri@FreeBSD.org
 COMMENT=	Network Time Protocol suite, refactored
 
 LICENSE=	BSD2CLAUSE
 
-BUILD_DEPENDS=	asciidoc:textproc/asciidoc
 LIB_DEPENDS=	libdns_sd.so:net/mDNSResponder
 
 USES=		bison gettext-runtime pkgconfig python shebangfix ssl waf
 USE_GITHUB=	yes
 USE_LDCONFIG=	${PREFIX}/lib/ntp
 
 SHEBANG_FILES=	${WRKSRC}/ntpclients/ntp*.py
 python_OLD_CMD=	@PYSHEBANG@
 
 CONFLICTS=	ntp ntp-devel openntpd
 
 MAKE_ENV=	NOSYNC=1 # workaround for the console problem: https://gitlab.com/NTPsec/ntpsec/issues/599
+
+OPTIONS_DEFINE=			DOCS
+
+DOCS_CONFIGURE_ENABLE=	doc
+DOCS_BUILD_DEPENDS=	asciidoctor:textproc/rubygem-asciidoctor # alternatively ntpsec can use asciidoc:textproc/asciidoc but it prefers asciidoctor
 
 PORTSCOUT=	limit:^\d+\. # prevent alpha-numeric strings
 
 .include <bsd.port.options.mk>
 
 .if ${OPSYS} == FreeBSD && ${OSVERSION} < 1200000 && ${SSL_DEFAULT} == base
 BROKEN=		Needs OpenSSL with TLSv1.3 support but OpenSSL in base on FreeBSD 11 doesn't support TLSv1.3
 .endif
 
 post-install: # autoplist: plist varies depending on the python version
 	@cd ${STAGEDIR}${PREFIX} && \
 		${FIND} * -type f -or -type l | ${SED} -e 's|^share/man/.*|&.gz|' >> ${TMPPLIST}
 
 .include <bsd.port.mk>