Set C<LIBGUESTFS_DEBUG=1> to enable verbose messages. This has the
same effect as using the B<-v> option.
+=item LIBGUESTFS_KERNEL
+
+Override the ordinary selection of appliance kernel.
+
=item LIBGUESTFS_MEMSIZE
Set the memory allocated to the qemu process, in megabytes. For
The C<more> command uses C<$PAGER> as the pager. If not
set, it uses C<more>.
+=item TMPDIR
+
+Location of temporary directory, defaults to C</tmp>.
+
+If libguestfs was compiled to use the supermin appliance then each
+handle will require rather a large amount of space in this directory
+for short periods of time (~ 80 MB). You can use C<$TMPDIR> to
+configure another directory to use in case C</tmp> is not large
+enough.
+
=back
=head1 EXIT CODE