Installe PicoGUI on Linux

I've install a Mandrake Linux 9.1 (the last version i know) wich include the SDL. But, when i want to install PicoGUI with the file of the snapshot and i run the commande ./configure, he didn't found the SDL library which is in the standard path (/usr/lib/). When i try to give the specific path for the SDL library with the command ./configure --with-sdl-prefix=/usr/lib/ but the SDL library doesn't found.
A friend with know linux better than me get a look to this installation. He try something but i don't know why and he doesn't understood why the ./configure don't found the SDL library on the standard path. Someone know what ?

Thanks for your response
Marine