where does 'pkg-config' takes its information from?

Question

where does 'pkg-config' takes its information from?

What files do I need when building a .deb package ?

Answer 1

http://linux.die.net/man/1/pkg-config

pkg-config retrieves information about packages from special metadata files. These files are named after the package, with the extension .pc. By default, pkg-config looks in the directory prefix/lib/pkgconfig for these files; it will also look in the colon-separated (on Windows, semicolon-separated) list of directories specified by the PKG_CONFIG_PATH environment variable.

Answer 2

I found the info whilst poking around: I did

pkg-config --debug dbus-1

and I got:

/usr/lib/pkginfo

/usr/share/pkgconfig

a lot of times... so I guess I just need to drop '.pc.' files in those directories when I am building a .deb package.