'GIT_FLUSH'::
If this environment variable is set to "1", then commands such
as 'git blame' (in incremental mode), 'git rev-list', 'git log',
- 'git check-attr', 'git check-ignore', and 'git whatchanged' will
+ 'git check-attr' and 'git check-ignore' will
force a flush of the output stream after each record have been
flushed. If this
variable is set to "0", the output of these commands will be done