root@hum-desktop:~/android-x86/iksaif_proj# repo init -u
git://git.iksaif.net/android-x86/kernel
fatal: manifest 'default.xml' not available
fatal: manifest default.xml not found
it is another method to user git, it's git clone.
git clone git://git.iksaif.net/android-x86/kernel <your target directory name>