I get this when using your patch:
[EMAIL PROTECTED] /tmp $ unp /usr/portage/distfiles/eix-0.14.2.tar.lzma
Bareword found where operator expected at /usr/bin/unp line 42, near "7z"
(Missing operator before z?)
syntax error at /usr/bin/unp line 42, near "7z"
Execution of /usr/bin/unp aborted due to compilation errors.
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