Missing gtk-config binary issues when building from source (Gtk3 only)

[Mildred Ki'Lya <mildred mildred fr>]

Hello, i'm not subscribed to the list, but I need help compiling Gtk-perl.

I'm building Gtk-perl using flatpak-builder. Basically, it builds everything from source, including gtk 
itself. There is something I don't quite get though, and I am wondering if any of you know this problem.

gtk 3.24.1 only is installed. Probably the gtk-config binary is no longer relevant since we have pkg-config, 
so it's not included any more in newer Gtk releases. That's what I suppose. Then, why does Gtk-perl still 
needs it instead of using pkg-config. Do you know how to compile Gtk-perl without?

Thank you

Mildred