How to install and make GTK+ for development use?

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http://askubuntu.com – I want to install gtk+ in order to make an application with a graphical environment.I went to the official website of gtk(gtk.org) and I tried to follow the instructions,but I wasn't able to make it work. I think that I have successfully managed to do the whole process till the part that I had to run make install and after that ldconfig. So far so good.After that though the complete chaos.I do not know how to set all these configurations so I can make my compilers know where to look for the include files. I just want to make it work in my Ubuntu when I start making a source file and then com (HowTos)