Adding missing OS dependencies for build-time

Author: timvaillancourt

README.md

@@ -29,7 +29,7 @@ Creates cluster-consistent point-in-time backups of MongoDB via wrapping 'mongod
 To build on CentOS/RedHat, you wil need the following packages (see command):
 
 ```
-yum install python python-devel python-virtualenv gcc
+yum install python python-devel python-virtualenv gcc make libffi-devel openssl-devel
 ```
 
 To install to default '*/usr/local/bin/mongodb-consistent-backup*':