The following NEW packages will be installed:
  libexpat1-dev{ab} libssl-dev{a} libssl-doc{a} python2.7-dev zlib1g-dev{ab}
0 packages upgraded, 5 newly installed, 0 to remove and 3 not upgraded.
Need to get 26.2 MB of archives. After unpacking 41.3 MB will be used.
The following packages have unmet dependencies:
 libexpat1-dev : Depends: libexpat1 (= 2.1.0-1+deb7u4) but 2.1.0-6 is installed.
 zlib1g-dev : Depends: zlib1g (= 1:1.2.7.dfsg-13) but 1:1.2.8.dfsg-2 is installed.
The following actions will resolve these dependencies:

     Keep the following packages at their current version:
1)     libexpat1-dev [Not Installed]
2)     libssl-dev [Not Installed]
3)     python2.7-dev [Not Installed]
4)     zlib1g-dev [Not Installed]



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