Fedora xen - Jun 2008 - Compiling xen from source: mkinitrd error: No module ehci-hcd

Hi,

I was trying to compile a xen kernel from source and I am having the
following errors:

[root@machine xen-3.0.4-testing.hg]# mkinitrd -v -f --with=sd_mod
--with=scsi_mod /boot/initrd-2.6.16.38-xen0.img 2.6.16.38-xen0
Creating initramfs
Looking for deps of module ehci-hcd
No module ehci-hcd found for kernel 2.6.16.38-xen0, aborting.

Any thoughts?