Hi folks,
I work on patch for support of segmented archives on unzip. It's created alpha patch, which will be modified in future
and probably (that's perhaps certainty ) it still contains bugs. However some testing should helps next devel, so if someone works with *.zip
multi-disk archives and want to try/test this new feature

a) here you can download scrach-build which you want - I did build only for F21 now (unzip-6.0-22.fc21.src.rpm)
    http://koji.fedoraproject.org/koji/taskinfo?taskID=9319882

(if you want check code direct in repository, patch is inside branch pstodulk_segment)

b) or you can test upstream version:
$ wget http://antinode.info/ftp/info-zip/unzip610c17s.zip
$ unzip unzip610c17s.zip
$ cd unzip610c17s
$ make -f unix/Makefile -j5 CC=cc PROD=compiled_unzip LOCAL_UNZIP=-DNO_EXCEPT_SIGNALS LFLAGS2=-L. generic
$ cd compile_unzip

- and try unzip your multidisk archive (is expected *.zip file as input! and all segments must be in the same directory!)
- multi-volume archives are not supported now (with different names, e.g.: main.zip not_main.z01 )

You could still see warning (or even error) messages about missing bytes and unssuported multi-disk archives.
Exit code could be wrong. This all you can ignore now, fix of these problems is in todolist for next month.
Important are unziped output files, that should be correct.
-> are files really OK? -> Get you same output as you get by old method of concatenation or
with pretreatment by "zip -FF segmented_archive.zip --out complex_archive.zip"?
Or you can use for unzip "-t" option for test of archive. Whatever you want try.

When you know that archive is ok and you get wrong output, please write me and add link to archive
if it is publicly accessible on the internet or write how can be create it.
(or attach it if it is small).

If you want, you can post same tests for this test-suite:
 https://github.com/pirat89/zip-tests

Thanks to all who will help with tests :-)

Regards,
Petr