Hi Benoit, here's an update of htmldoc to 1.9.17. Here are some of the 
main changes from CHANGES.md:

- Added new `--pre-indent` option
- Now link to CUPS library instead of embedding its HTTP code.
- Updated PostScript and PDF date/time information to use UTC

And a few fixes are mentioned as well:
- Fixed a markdown parsing bug
- Fixed a relative URL handling bug
- Fixed a crash bug with bad title images
- Fixed some minor CodeQL warnings.

The main change in our port is that we add a new LIB_DEPENDS on 
print/cups,-libs (and ssl and crypto can be removed from WANTLIB as a 
result).

It also looks like the patch to work around an llvm 8 bug can go away at 
this point? Indeed the build did not freeze for me when I compiled on an 
amd64 box.

ok on the update below?

Index: Makefile
===================================================================
RCS file: /cvs/ports/print/htmldoc/Makefile,v
diff -u -p -u -r1.57 Makefile
--- Makefile	27 Sep 2023 14:32:02 -0000	1.57
+++ Makefile	19 Jan 2024 23:02:40 -0000
@@ -1,6 +1,6 @@
 COMMENT =		convert HTML pages to PDF/PS format
 
-V =			1.9.16
+V =			1.9.17
 DISTNAME =		htmldoc-${V}
 CATEGORIES =		print www
 
@@ -11,7 +11,7 @@ MAINTAINER =		Benoit Lecocq <benoit@open
 # GPLv2
 PERMIT_PACKAGE =	Yes
 
-WANTLIB += c crypto m ssl z jpeg png ${COMPILER_LIBCXX}
+WANTLIB += ${COMPILER_LIBCXX} c cups jpeg m png z
 
 COMPILER =		base-clang ports-gcc base-gcc
 
@@ -19,7 +19,8 @@ DISTFILES =		${DISTNAME}-source${EXTRACT
 SITES =	https://github.com/michaelrsweet/htmldoc/releases/download/v${V}/
 
 LIB_DEPENDS =		graphics/jpeg \
-			graphics/png
+			graphics/png \
+			print/cups,-libs
 
 CONFIGURE_STYLE =	gnu dest
 CONFIGURE_ARGS +=	--without-gui --disable-gnutls
Index: distinfo
===================================================================
RCS file: /cvs/ports/print/htmldoc/distinfo,v
diff -u -p -u -r1.19 distinfo
--- distinfo	3 Jun 2022 09:24:54 -0000	1.19
+++ distinfo	19 Jan 2024 23:02:40 -0000
@@ -1,2 +1,2 @@
-SHA256 (htmldoc-1.9.16-source.tar.gz) = sQhjhcTBbNq+QoqxqgQSZrrr7jnyIs9qOUe0ECe32uM=
-SIZE (htmldoc-1.9.16-source.tar.gz) = 3389563
+SHA256 (htmldoc-1.9.17-source.tar.gz) = oEpxy6RTyE3+YokYcov0vEB33BeyfbgjCYXj5EdGpmM=
+SIZE (htmldoc-1.9.17-source.tar.gz) = 3289176
Index: patches/patch-htmldoc_http_c
===================================================================
RCS file: patches/patch-htmldoc_http_c
diff -N patches/patch-htmldoc_http_c
--- patches/patch-htmldoc_http_c	11 Mar 2022 19:51:02 -0000	1.4
+++ /dev/null	1 Jan 1970 00:00:00 -0000
@@ -1,14 +0,0 @@
-Index: htmldoc/http.c
---- htmldoc/http.c.orig
-+++ htmldoc/http.c
-@@ -31,6 +31,10 @@
- #  include <poll.h>
- #endif /* HAVE_POLL */
- 
-+#if defined(__OpenBSD__)
-+#  define CUPS_RAND() arc4random() 
-+#  define CUPS_SRAND(v)
-+#endif
- 
- /*
-  * Some operating systems have done away with the Fxxxx constants for
Index: patches/patch-htmldoc_ps-pdf_cxx
===================================================================
RCS file: patches/patch-htmldoc_ps-pdf_cxx
diff -N patches/patch-htmldoc_ps-pdf_cxx
--- patches/patch-htmldoc_ps-pdf_cxx	11 Mar 2022 19:51:02 -0000	1.3
+++ /dev/null	1 Jan 1970 00:00:00 -0000
@@ -1,16 +0,0 @@
-Work around an LLVM 8.0.0 optimizer bug that causes htmldoc to spin.
-https://github.com/michaelrsweet/htmldoc/issues/349
-https://bugs.llvm.org/show_bug.cgi?id=41998
-
-Index: htmldoc/ps-pdf.cxx
---- htmldoc/ps-pdf.cxx.orig
-+++ htmldoc/ps-pdf.cxx
-@@ -5440,7 +5440,7 @@ parse_pre(tree_t *t,		/* I - Tree to parse */
- 		line[10240],
- 		*lineptr,
- 		*dataptr;
--  int		col;
-+  volatile int	col;
-   float		width,
- 		height,
- 		rgb[3];