[ubuntu] Codeblocks / gtk+

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http://ubuntuforums.org – I would like to start developing using codeblocks ide and gtk+ 3 toolkit. I have this setup in Windows and it has worked great. I want to get it setup to work properly on Ubuntu and am having trouble. Could someone please offer some advice or point me in the right direction? I have tried to unpack the gtk+-3.6.4 archive and place it in /opt. I then created a simple project in codeblocks and when I try and compile it I get an error telling me that <gtk/gtk.h> cannot be found. Thanks in advance. (Hardware)