[GNU Lesser General Public License (LGPL)](http://www.gnu.org/licenses/lgpl-3.0.txt)

And, as an exception to the LGPL:

You are permitted to include a version of this library in your application,
without complying with section 4. d) 0) of LGPL 3.0
(requiring recipients of your application to be able to relink against
modified versions of the library).

This permission is granted if and ONLY if the resulting application binary
issue is intended for execution in any one of the following environments:

    * Apple Inc. iOS

Additional environments may be added to this list in the future.
All other terms of the LGPL continue to apply.