I am trying to build a kernel ( 2.6.38.4) on fedora 12 in a virtual machine

according to the data found at :http://kernelnewbies.org/KernelBuild

i have successfully completed until: "Make all"

but when i tried to run: su -c "make modules_install install"

i got an error : "find :/lib/modules/2.6.38.4/kernel/drivers/gpu/drm: no such file    or directory

May i know how can i overcome this?