Try waiting a few hours, and re-fetching the source tree. If you can't wait, try fetching a tree from a day or two beforehand. Make sure to include the relevant error messages, and any peculiarities of your setup. And then run a normal make build . This means it is always up to the administrator to make the necessary modifications there.
Upgrades are no exception.
The most important thing you can do is to clean out your obj directories. This will identify any extra cruft in your source tree. From time to time, files or directories are added to, or removed from the file hierarchy. Also, ownership information for portions of the filesystem may changes. To make this change possible, the named user was created.