When using the dylan branch on Ubuntu 14.04, do_patch for the kernel fails because guilt errors out with "Unsupported version of git (1.9.1)". I'm aware we've dropped guilt in newer releases, but if we want dylan to continue to work on top of newer distros such as this we will need to address this.
On further reflection, we don't actively support 1.4 anymore, so I'm marking this as WONTFIX.