Does anyone install Asterisk under Fedora 7?

hello, all of asteriskers:
I try to install asterisk and zaptel under Fedora 7. but the gcc can not find the build under /lib/modules/kernel-version. the fedora 7 has a default kernel, which is kernel-xen. How can i download the kernel-devel for xen. i think xen is not necessary for asterisk and zaptel. where can i downlaod fedora 7 DVD version without xen package? thanks!
zhu8080 … os/Fedora/