Add FAQ

Author: terhorst

README.rst

@@ -439,6 +439,11 @@ the sequence of intermediate estimates ``.model.iter<k>.json`` which
 are saved by ``--estimate`` in the ``--output`` directory. By plotting
 these, you can get a sense of whether the optimizer is overfitting and
 requires additional regularization.
+
+Frequently asked questions
+==========================
+Running the binary installer dies with the error message ``ImportError: /lib64/libc.so.6: version `GLIBC_2.14' not found (required by ...)``. How can I fix this?
+    This is due to a ``glibc`` version mismatch between your system and the build server I use to create the binary installers. I am unable to create binaries for older versions of ``glibc``. Your options are to either a) upgrade ``glibc`` on your system (which would probably require upgrading your operating system); or b) build SMC++ yourself by following the `build instructions`_.
 
 File formats
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