cross-alpha-gdb from home:ChickeNES:osdev project
Select Your Operating System
Add repository and install manually
For openSUSE Tumbleweed run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:ChickeNES:osdev/openSUSE_Tumbleweed/home:ChickeNES:osdev.repo zypper refresh zypper install cross-alpha-gdb