Comment 5 for bug 1315844

OK found this info for ubuntu 14.04

https://launchpad.net/ubuntu/trusty/+source/openssl/+changelog

openssl (1.0.1f-1ubuntu1) trusty;

  * Dropped changes:
    - debian/patches/arm64-support: included in debian-targets.patch
    - debian/patches/no_default_rdrand.patch: upstream
    - debian/patches/openssl-1.0.1e-env-zlib.patch: zlib is now completely
      disabled in debian/rules

So is zlib disabled in 14.04 which stops stunnel using compression. zlib is really useful for usenet when downloading headers.