Index: head/graphics/qgis-ltr/Makefile
===================================================================
--- head/graphics/qgis-ltr/Makefile
+++ head/graphics/qgis-ltr/Makefile
@@ -148,6 +148,9 @@
 post-patch:
 	@${REINPLACE_CMD} -e 's|markupsafe ||g' \
 		${WRKSRC}/python/ext-libs/CMakeLists.txt
+# Build failure with txt2tags > 3 (dropped --css-sugar & --css-inside)
+# https://github.com/qgis/QGIS/issues/33516
+	@${REINPLACE_CMD} -e 's|--css-sugar --css-inside||' ${WRKSRC}/doc/INSTALL.t2t ${WRKSRC}/doc/news.t2t
 
 pre-configure:
 	${MKDIR} ${CONFIGURE_WRKSRC}/bin && ${LN} -s ${PYTHON_CMD} ${CONFIGURE_WRKSRC}/bin/python3
Index: head/graphics/qgis/Makefile
===================================================================
--- head/graphics/qgis/Makefile
+++ head/graphics/qgis/Makefile
@@ -153,6 +153,9 @@
 	@${REINPLACE_CMD} -e 's|"-mllvm -inline-threshold=128"|"-O1"|g' \
 		${WRKSRC}/src/core/CMakeLists.txt
 .endif
+# Build failure with txt2tags > 3 (dropped --css-sugar & --css-inside)
+# https://github.com/qgis/QGIS/issues/33516
+	@${REINPLACE_CMD} -e 's|--css-sugar --css-inside||' ${WRKSRC}/doc/INSTALL.t2t ${WRKSRC}/doc/news.t2t
 
 pre-configure:
 	${MKDIR} ${CONFIGURE_WRKSRC}/bin && ${LN} -s ${PYTHON_CMD} ${CONFIGURE_WRKSRC}/bin/python3
Index: head/textproc/txt2tags/Makefile
===================================================================
--- head/textproc/txt2tags/Makefile
+++ head/textproc/txt2tags/Makefile
@@ -2,8 +2,7 @@
 # $FreeBSD$
 
 PORTNAME=	txt2tags
-PORTVERSION=	2.6
-PORTREVISION=	3
+PORTVERSION=	3.4
 CATEGORIES=	textproc
 
 MAINTAINER=	lbartoletti@FreeBSD.org
@@ -12,8 +11,8 @@
 LICENSE=	GPLv2
 LICENSE_FILE=	${WRKSRC}/COPYING
 
-USES=		python:2.7 shebangfix
-SHEBANG_FILES=	extras/html-update.sh txt2tags
+USES=		python:3.6+ shebangfix
+SHEBANG_FILES=	txt2tags.py
 USE_GITHUB=	yes
 NO_BUILD=	yes
 NO_ARCH=	yes
@@ -25,7 +24,7 @@
 OPTIONS_DEFINE=	DOCS EXAMPLES
 
 do-install:
-	${INSTALL_SCRIPT} ${WRKSRC}/txt2tags ${STAGEDIR}${PREFIX}/bin
+	${INSTALL_SCRIPT} ${WRKSRC}/txt2tags.py ${STAGEDIR}${PREFIX}/bin/txt2tags
 
 do-install-EXAMPLES-on:
 	@cd ${WRKSRC}/samples && ${COPYTREE_SHARE} . ${STAGEDIR}${EXAMPLESDIR}
@@ -33,7 +32,10 @@
 
 do-install-DOCS-on:
 	@${MKDIR} ${STAGEDIR}${DOCSDIR}
-	${INSTALL_DATA} ${WRKSRC}/ChangeLog ${WRKSRC}/README ${STAGEDIR}${DOCSDIR}
-	${INSTALL_DATA} ${WRKSRC}/doc/*/*.pdf ${STAGEDIR}${DOCSDIR}
+	${INSTALL_DATA} ${WRKSRC}/CHANGELOG.md ${WRKSRC}/README.md ${STAGEDIR}${DOCSDIR}
+.for doc in markup rules userguide
+	@cd ${WRKSRC}/docs/${doc} && ${WRKSRC}/txt2tags.py ${doc}.t2t
+	${INSTALL_DATA} ${WRKSRC}/docs/${doc}/${doc}.html ${STAGEDIR}${DOCSDIR}
+.endfor
 
 .include <bsd.port.mk>
Index: head/textproc/txt2tags/distinfo
===================================================================
--- head/textproc/txt2tags/distinfo
+++ head/textproc/txt2tags/distinfo
@@ -1,3 +1,3 @@
-TIMESTAMP = 1474656184
-SHA256 (txt2tags-txt2tags-2.6_GH0.tar.gz) = c87b911ac5cc97dd2fdb6067601cf4fbd0094a065f6b7a593142fa75e3a924c1
-SIZE (txt2tags-txt2tags-2.6_GH0.tar.gz) = 4509515
+TIMESTAMP = 1577715579
+SHA256 (txt2tags-txt2tags-3.4_GH0.tar.gz) = 989c8cc0bc69c5b2acad92cc08e61786e06ee5093969c232adda2eb905f9a00d
+SIZE (txt2tags-txt2tags-3.4_GH0.tar.gz) = 252256