* Flag `--no-build-hook' to disable distributed builds.

* queryDeriver in daemon mode: don't barf if the other side returns an
  empty string (which means there is no deriver).

src/libstore/remote-store.hh

@@ -71,6 +71,7 @@ private:
     FdSink to;
     FdSource from;
     Pid child;
+    unsigned int daemonVersion;
 
     void processStderr(Sink * sink = 0, Source * source = 0);