Just do everything in one sweep imho and we should probably also use https for deb.debian.org as I would guess it's only a matter of time before http gets redirected anyway.

Revert changes to URLs by request of tcberner

Use USES= metaport (suggested by tcberner)
Update URL in pkg-descr to https

Remove empty line in devel/cmake-core/common.mk

Remove temporary USES variable again....

Remove -L/usr/lib path

Adjust include dirs in xslt-config
Install m4 file
Enable profiler
Create plugin directory

Adjust cflags in pkgconfig file and xml2-config

Forgot to remove extra USES= line during testing

Adjust prefix path in xml2-config
Add -L/usr/lib to libs in pkgconfig file (.pc) and xml2-config
Install m4 file

Backport commit https://gitlab.gnome.org/GNOME/libxml2/-/commit/b66ce0bba83febe2f4d119097a0391f5d886c3b4 and adjust patch for pkgconfig (.pc) file

Fix prefix path in pkgconfig (.pc) files

I would also appreciate some guidence regarding libxslt's pkgconfig (pc) file(s)

Output is now:

prefix=/usr/local
exec_prefix=${prefix}
libdir=${prefix}/lib
includedir=${prefix}/include
modules=1

Fix pc file

Hmm... so the generated pc file is a bit wonky :-/

To avoid unnecessary "foot shooting" always enable the debugging module

Rename DEBUG option to DEBUG_MOD as upstream refers to as "the debugging module"
Enable it by default as it's required by itstool to build gtk-doc

Compile and tested on FreeBSD 13.0-STABLE #2 stable/13-n248607-93a95ebbf7c (amd64) (make, make check-plist,make test)
Poudriere testport OK 12.2-RELEASE (amd64)
Poudriere testport OK 13.0-RELEASE (i386)

Include py-libxml2 changes

Move DOCS to plist file in master port
Move TEST_TARGET to TEST menu option

You need to enable the "TEST" menu option, I don't think we need safeguard it though as if you unset TEST_TARGET it'll exit without running any tests which I would regard as a false positive.

Help CMake determine correct (target) version of Python if multiple versions are installed

Additional note:
mandree@ tested all variants of Python successfully using Poudriere

Finally fix py-libxml2

Hi koobs!

Poudriere fails when the python slave port is pulled in as a dependency

[00:00:04] Warning: (textproc/py-libxml2@py38): Error: Invalid FLAVOR 'py38' for textproc/py-libxml2

Guard PORTDOCS variable for slave ports
Drop patch for removing version infromation for install path of cmake files (not needed)
Reference:
https://cmake.org/cmake/help/latest/command/find_package.html - Config Mode Search Procedure

Rework python support option (cred tcberner)
Fix plist issue for documentation
Use correct install path variable for python slave port