pkg-config and old pixman version popping up breaks gtk and cairo

[Riccardo Mottola <riccardo.mottola%libero.it@localhost>]

Hi,

I upgraded my laptop to 10.1 (the installation was messed up in the past 
with tests, unstable versions... but seems mostly ok now) and I also 
updated pkg using pkgin and binary packages.
Essentially, the only problem i reported was osabi NetBSD which i don't 
have because I cannot force-install it.

using installed packages seems to work (X, window manager, terminals, 
etc etc)

However, when I compile my own stuff (e.g. GNUstep or ArcticFox) I have 
issues where headers are not found.
This works on other NetBSD systems, so the issue is not NetBSD support, 
but this specific setup. Trying to understand what is wrong.

E.g. GNUstep fails with:
In file included from CairoSurface.m:25:
../../Headers/cairo/CairoSurface.h:28:10: fatal error: cairo.h: No such 
file or directory
   28 | #include <cairo.h>
      |          ^~~~~~~~~
compilation terminated.
gmake[5]: *** [/System/Library/Makefiles/rules.make:534: 
obj/cairo.obj/CairoSurface.m.o] Error 1
gmake[5]: *** Waiting for unfinished jobs....
In file included from ../../Headers/fontconfig/FCFontInfo.h:32,
                 from ../../Headers/cairo/CairoFontInfo.h:31,
                 from CairoFontInfo.m:32:
../../Headers/fontconfig/FCFaceInfo.h:35:10: fatal error: ft2build.h: No 
such file or directory
   35 | #include <ft2build.h>
      |          ^~~~~~~~~~~~
compilation terminated.


yet my cairo package is installed:
cairo-1.18.2        Vector graphics library with cross-device output support

 find /usr/pkg -name cairo.h
/usr/pkg/include/cairo/cairo.h

so it is even in a correct and prominent place.
-rw-r--r--  1 root  wheel  118325 Sep  1 15:09 
/usr/pkg/include/cairo/cairo.h

permissions look fine too!

So I test pkg-config:
c$ pkg-config --cflags cairo
Package dependency requirement 'pixman-1 >= 0.40.0' could not be satisfied.
Package 'pixman-1' has version '0.38.4', required version is '>= 0.40.0'


ouch!

$ pkg_info | grep pixman
pixman-0.44.2       Library of low-level pixel manipulation routines

but I have 0.44 !! where is pixman-1 coming from??

It is coming from:
/usr/X11R7/include/pixman-1 ?

I'm confused now.

Riccardo