How to install libgpgme on Heroku?

Question

Heroku

Hey!
I want to host my Django app on Heroku. Only now I need to download dependencies from mine requirements.txt, there is gpg there and it does not want to be installed. Here's what he says:

remote:        Collecting gpg==1.10.0
remote:          Downloading gpg-1.10.0.tar.gz (39 kB)
remote:            ERROR: Command errored out with exit status 1:
remote:             command: /app/.heroku/python/bin/python -c 'import sys, setuptools, tokenize; sys.argv[0] = '"'"'/tmp/pip-install-6exp_35v/gpg/setup.py'"'"'; __file__='"'"'/tmp/pip-install-6exp_35v/gpg/setup.py'"'"';f=getattr(tokenize, '"'"'open'"'"', open)(__file__);code=f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, __file__, '"'"'exec'"'"'))' egg_info --egg-base /tmp/pip-pip-egg-info-be0lvrsd
remote:                 cwd: /tmp/pip-install-6exp_35v/gpg/
remote:            Complete output (1 lines):
remote:            Could not find gpgme-config.  Please install the libgpgme development package.
remote:            ----------------------------------------
remote:        ERROR: Command errored out with exit status 1: python setup.py egg_info Check the logs for full command output.

Yes, I tried installing libgpgme, and this is the problem:

~ $ apt-get install libgpgme-dev
Reading package lists... Done
Building dependency tree       
Reading state information... Done
W: Not using locking for read only lock file /var/lib/dpkg/lock-frontend
W: Not using locking for read only lock file /var/lib/dpkg/lock
E: Unable to locate package libgpgme-dev
~ $

What to do?
Thank you!

PS : All code requirements.txtcan be found in the repository on GitHub