[lfs-support] LFS-7.2 host system tar version

Firerat firer4t at googlemail.com
Fri Nov 23 16:53:51 PST 2012

On 24 Nov 2012 00:33, "nettxzl" <nettxzl at gmail.com> wrote:
> (Sorry if this comes through twice. My first attempt seems to have
> Hi,
> I was starting the gcc-4.7.1 (Pass 1) build in Chap. 5 and I was
> trying to unpack the files compressed with xz following the command
> given there:
> tar -Jxf ../mpfr-3.1.1.tar.xz
> but I got this error message:
> tar: invalid option -- J
> I guessed my host system tar is too old, but it is tar-1.19 and this
> is newer than the minimum version, tar-1.18, stated in the host system
> requirements.
> It's not a problem because I can unpack the files in two steps: first
> with xz, then with tar.
> But I think you may want to update the tar version in the host system
> requirements.
> I checked the tar release info at
> -J was only introduced as a new short option in tar-1.21 as an alias for
> And in tar-1.22, the --xz option was introduced to support xz
> compression, while the short option -J was reassigned as a shortcut
> for --xz.

I'm not sure when, but at some point tar automagically figures out which
compression is used so I never use opts for unarchiving, just tar xf  or
vxf if I fancy some speed reading challenge.

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