From Newsgroup: alt.os.linux.ubuntu

Whitney Ryan <whitneyryan@nospam.invalid> writes:

Richard Kettlewell wrote, on Mon, 12 Jan 2015 22:39:07 +0000:

zlib1g-dev also depends on zlib1g.

The command run was
http://ubuntuforums.org/showthread.php?t=1528204
$ sudo apt-get install --reinstall zlibc zlib1g zlib1g-dev

If all you wanted to build something against zlib then all you needed
was to install zlib1g-dev, you didn’t need to reinstall anything.

--
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