The build tools help to verify, troubleshoot and perform production builds for GPT packages from the rawest source tree from to the bundled deliverables. But it is important to understand that the buildtools do not create GPT packages from source trees without the GPT packaging data files present in each source directory. The build tools can not perform the creation of the data files, the developer must create these as defined in "A User Guide to the Grid Packaging Tools" and these files must be available within the source tree prior to running the build tools.