How to make squashfs of 3.1 with mksquash 4.0

[Bruno Wolff III]

On Mon, Mar 21, 2011 at 07:57:46 -0500,
  Bruno Wolff III <bruno at wolff.to> wrote:
> On Mon, Mar 21, 2011 at 16:35:59 +0800,
>   Eric Zhong <ericiszhongwenjia at gmail.com> wrote:
> > I have to make a install.img for F10 on F13
> > Squashfs Version : F13 = 4.0 ; F10 = 3.1
> > I can't mount 4.0 on F10.
> > so How can i make a version of 3.1 on F13 ? Are there any options ?
> 
> As far as I can tell, mksquashfs doesn't have a way to build using older
> formats. So you either need to use an older version of mksquashfs on the
> F13 system or you need to use a newer kernel (that supports the 4.0 format)
> for your F10 build.

I forgot to suggest one way to use the old mksquashfs. You can run
livecd-creator in mock to use f10 tools for the build. Assuming you don't
really care about which tools you are using, that's probably the best
way to do the build.