dtc from home:olh:xen-buildrequires project
Select Your Operating System
Add repository and install manually
For SLE 12 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:olh:xen-buildrequires/SLE_12/home:olh:xen-buildrequires.repo zypper refresh zypper install dtc