pkg/54638: pkg-config and builtin packages

[joern.clausen%uni-bielefeld.de@localhost]

>Number:         54638
>Category:       pkg
>Synopsis:       pkg-config and builtin packages
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    pkg-manager
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Tue Oct 22 12:15:00 +0000 2019
>Originator:     Joern Clausen
>Release:        
>Organization:
Bielefeld University
>Environment:
>Description:
This fails on Solaris:

$ pkg-config --cflags fontconfig
Package uuid was not found in the pkg-config search path.
Perhaps you should add the directory containing `uuid.pc'
to the PKG_CONFIG_PATH environment variable
Package 'uuid', required by 'fontconfig', not found

As a consequence, pkg-config for every package depending on fontconfig also fails:

$ pkg-config --cflags cairo
Package uuid was not found in the pkg-config search path.
Perhaps you should add the directory containing `uuid.pc'
to the PKG_CONFIG_PATH environment variable
Package 'uuid', required by 'fontconfig', not found

This makes pkg-config unusable as a tool to build software packages outside pkgsrc, as dependencies are reported as missing, although the corresponding packages are installed.


The reason is, that fontconfig.pc contains

Requires.private:  uuid

devel/libuuid gets not installed on Solaris, because it is considered builtin. The same problem can probably occur for e.g. zlib, which is a requirement for freetype2, but can also be provided by the OS.

IMHO the .pc files for pkg-config should be adjusted, depending if a requirement is builtin or not. Another solution might be to install dummy .pc files for builtin packages.


PS: The easy solution would be to add devel/libuuid to PREFER_PKGSRC (which I did for e.g. zlib), but this package currently does not build on Solaris. But I think the interplay between builtin and pkg-config is a more fundamental problem.
>How-To-Repeat:

>Fix: