I had the similar problem but I untar it in two step to get around it:
1st gunzip *.tgz
2nd tar it in usual without z option
> Date: Mon, 17 Aug 2009 08:25:15 +0200
> From: sp...@xray.bmc.uu.se
> To: gmx-users@gromacs.org
> Subject: Re: [gmx-users] topolbuild1_2_1.tgz decompressing problem
>
> weixin wrote:
> > It works in my Window OS.
> >
> >
> >
> > 2009/8/2 Nancy <nancy5vi...@gmail.com <mailto:nancy5vi...@gmail.com>>
> >
> > Hello,
> >
> > I downloaded "topolbuild1_2_1.tgz" from the URL:
> > http://www.gromacs.org/@api/deki/files/40/=topolbuild1_2_1.tgz
> >
> > However, when I tried to decompress the file, I received the
> > following error message:
> >
> > # tar -xvf topolbuild1_2_1.tgz
>
> tar xzvf topolbuild1_2_1.tgz
>
>
> > tar: This does not look like a tar archive
> > tar: Skipping to next header
> > tar: Archive contains obsolescent base-64 headers
> > tar: Error exit delayed from previous errors
> >
> > I also tried to obtain topolbuild 1.2.1 from
> >
> >
> > http://oldwww.gromacs.org/component/option,com_docman/task,doc_download/gid,111/Itemid,26/
> >
> > but that did not work either. Please advise.
> >
> > Thank you.
> > Nancy
> >
> >
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>
> --
> David.
> ________________________________________________________________________
> David van der Spoel, PhD, Professor of Biology
> Dept. of Cell and Molecular Biology, Uppsala University.
> Husargatan 3, Box 596, 75124 Uppsala, Sweden
> phone: 46 18 471 4205 fax: 46 18 511 755
> sp...@xray.bmc.uu.se sp...@gromacs.org http://folding.bmc.uu.se
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