some ports do not build with libxul-10.0.7

[kron]

Hello,

The www/libxul was updated to 10.0. It is mentioned
in UPDATING with some instructions for those wanting
to stay with 1.9.2.

I thought I could go with the new version and updated
www/libxul (using portmaster). It went OK.

Now I can't build some other ports, for example
deskutils/chmsee:

/usr/ports/deskutils/chmsee> make

  chmsee is using libxul19 for gecko support, but you can
  change that by defining WITH_GECKO to the following values:

    libxul19

===>  License GPLv2 accepted by the user
===>  Extracting for chmsee-1.3.1.1_3
=> SHA256 Checksum OK for chmsee-1.3.1.1.tar.gz.
===>  Patching for chmsee-1.3.1.1_3
===>   chmsee-1.3.1.1_3 depends on file: /usr/local/lib/libxul/libxul.so 
- found

... snipped ...

-- checking for one of the modules 
'mozilla-gtkmozembed-embedding>=1.9;xulrunner-gtkmozembed>=1.9'
CMake Error at /usr/local/share/cmake/Modules/FindPkgConfig.cmake:363 
(message):
   None of the required
   'mozilla-gtkmozembed-embedding>=1.9;xulrunner-gtkmozembed>=1.9' found
Call Stack (most recent call first):
   CMakeLists.txt:11 (pkg_search_module)


-- Configuring incomplete, errors occurred!
*** [do-configure] Error code 1

Stop in /usr/ports/deskutils/chmsee.

Similar failure happens in www/gecko-mediaplayer.

Any suggestions?

TIA
Oli