Can't install zlib1g-dev on etch?

[Eric Adum]

Hi,

When I try to install zlib1g-dev on etch, I get the following error:

The following packages have unmet dependencies:
  zlib1g-dev: Depends: zlib1g (= 1:1.2.3-13) but 1:1.2.3.3.dfsg-3 is to be
installed

I've tried switching to version 3-13 with the command:
 apt-get -t '*3-13' install zlib1g
but it says "zlib1g is already the newest version."

I'm running etch/amd64.

Thanks,
Eric