I tried the following:

dub install derelict

but i only received the following error

The 'install' Command was renamed to 'fetch'. Please update your
scripts.
Getting a release version failed: No package derelict was found
matching the dependency >=0.0.0
Retry with ~master...
Fetching derelict ~master...
Error executing command install: Couldn't resolve host name on
handle D20220

Trying the fetch command leads to the same error. I hope somebody
can help me.

Thanks,

Martin