Hi Guido, thanks for finding this. The issue is caused by the outdated version of xz in Debian (5.1.0alpha). The option --block-list was added in 5.2.0 [1]. I think that the most obvious solution is to release the new version of xz in debian + add a warning if we try to recreate a tarball with --block-list, but the xz version is < 5.2.0.
Cheers, Tomasz [1] http://git.tukaani.org/?p=xz.git;a=blob;f=NEWS;hb=HEAD
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