'GIT_INDEX_VERSION'::
This environment variable allows the specification of an index
version for new repositories. It won't affect existing index
- files. By default index file version [23] is used.
+ files. By default index file version 2 or 3 is used. See
+ linkgit:git-update-index[1] for more information.
'GIT_OBJECT_DIRECTORY'::
If the object storage directory is specified via this