make dist broken

[git|master] weasel@valiant:.../obfsproxy$ git rev-parse HEAD a58146de85899f73a2c8b9abe3b8de8b6cb25dc8 [git|master] weasel@valiant:.../obfsproxy$ make dist make: *** No rule to make target doc/protocol-spec.txt', needed by distdir'. Stop.