GTK+ installation

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http://stackoverflow.com – I am using ubuntu 12.10. I have CODE:Blocks IDE. I want to use gtk+ but when i create a project and build it it says it cannot find gtk.h file. I downloaded gtk+, glib, pango, gdk-pixbuf and atk by writing git clone git://git.gnome.org/gtk+, git clone git://git.gnome.org/glib ... then i unzipped all libraries. every thing was fine unti here. To install gtk+ i write "./configure --prefix=/opt/gtk" it starts processing, most of the process goes OK, but then it comes with an error ... checking for some Win32 platform... no checking whether build environment is sane... yes checking for pk (HowTos)