I'm trying to compile the "Asynchronous File Listing" sample from http://live.gnome.org/Vala/GIOSample...s_File_Listing

and I get this error:
Code:
error: gio-2.0 not found
I already installed the package in which gio-2.0.pc is in (libglib2.0-dev) but I just cannot figure out why I'm still getting this error.

Any help?