Missing module_ssldb? Redis module won't compile.

I'm trying to compile with Redis support. I'm on Ubuntu 13.04, installed the recommended deps via apt, installed Hiredis from source.

When I `make REDIS=true`, it compiles for a while then stops with the error:

```
make: *** No rule to make target `module_ssldb.o', needed by `zmap'.  Stop.
```

Is there supposed to be a module_ssldb somewhere?
