Kiax - an IAX Softphone

When I try to compile kiax2.pro (I am using QTCreator 1.2 ) I have problem with sprintf funk or atol. They are not declared. But, when I added headers, its works. It's isn't all. I don't have lib. They mast be in "# LIBSDIR +=./libs-linux". But this folder is empty. Where I can take this libs?