Ok, I installed gpc with the tar.gz gived with the src.rpm, and it works !!!
But, I would know how compile without the --automake option, because xwpe-alpha or rhide don't permit to modify the basic command line... (and I don't want to make remplacement script, but if I dont' find something, i will do that..)
Thks for all, it was very cool to help me like that !!!