I downloaded git master, ran ./build.sh, and then ./bin/dub build.
When running ./bin/dub --help I get the following error:
Fatal Error while loading '/usr/lib/libphobos2.so.0.64':
The module 'std.regex' is already defined in './bin/dub'.
[1] 3286 segmentation fault (core dumped) ./bin/dub --help