use gtar and not tar under solaris

[Duncan Coutts]

On Tue, 2009-08-04 at 10:15 +0200, Christian Maeder wrote:
> Hi,
> 
> I've just been informed that unpacking the binary (i386) solaris
> distribution using bunzip2 and tar:

It may work better in future if you use a non-GNU tar to pack it up in
the first place. GNU tar uses a non-standard tar format by default.
Solaris tar would likely have more luck unpacking a POSIX/USTAR tar
format file. It's also possible to use gnu tar to make standard tar
format files, using --format ustar rather than gnu tar's default of
--format gnu.

Duncan
(who now knows an unhealthy amount about tar file formats after writing
a Haskell package to read them)