Add note about libmongoc installation instructions to readme

README.md

@@ -17,6 +17,11 @@ The API should still be considered experimental, but I'm not expecting changes a
 The driver currently only builds on Unix, tested on Mac Os X and Linux so far. It's compatible with MongoDB 2.4 up to 3.4 and
 has full replica set and SSL support.
 
+## Installation
+
+If you have any trouble installing the crate (linking openssl can be
+tricky) please check out the [installation instructions for the C driver](http://mongoc.org/libmongoc/current/installing.html).
+
 ## Logging
 
 All internal logging by mongoc is redirected to the macros in the [log