On my computer, the list is completely empty (not even an "available through pgk_config").
Did you mean by calling pkg-config from command-line ?
If so, remember tha each library in ubuntu is usually split into two parts - library binaries (required to run programs using it) and library development files - the second package is needed to be on pkg-config list (it also contains header files etc). Generally package with development files end with "-dev" suffix.
Regards
BYO
I meant from the "library" tab of the properties of a project. On the other hand, by calling pkg-config from command line ("pkg-config --list-all"), I get a lot of results.
This said, your question made me realize that my "pkg-config --list-all" ended with an error :
Package 'glipper' has no Name: field
I got rid of glipper, to see what would happen : a new error :-).
Variable 'libdir' not defined in '/usr/lib/pkgconfig/ripperX.pc'
So I got rid of ripperX as well (I don't use it anyway), and now the list of packages in "pkg-config --list-all" is, I have to admit, much longer. Must importantly, it solved my bug in code::blocks !
Conclusion : Code::Blocks doesn't show any library if "pkg-config --list-all" ends with an error.
BYO, thanks for your help ;-)