bad confs provided error when building from github 6.7

Trying to build from github branch 6.7.  I was able to get everything checked out and compiling in eclipse.  But when I run step 2 (ant) under https://github.com/vaadin/vaadin/tree/7.6#building-a-package I get the following error:

BUILD FAILED
d:\code\git\vaadin\build.xml:12: The following error occurred while executing this line:
d:\code\git\vaadin\themes\build.xml:54: The following error occurred while executing this line:
d:\code\git\vaadin\common.xml:317: impossible to build ivy path: bad confs provided: build not found among [build-provided]

Total time: 3 minutes 53 seconds

Not sure where to go from here, any help is appreciated

Thanks
Dave

I meant 7.6 not 6.7...
I tried this on linux as well and I got the same error

Dave