MongoDB Compile Page should indicate the requirement for compiling with SSL.

To compile MongoDB with --ssl option, e.g.

$ scons --ssl all

one needs to install the libssl-dev (debian/ubuntu) or openssl-devel (redhat/centos). Otherwise, an error message:

fatal error: openssl/err.h: No such file or directory

could be thrown.

The page link: http://www.mongodb.org/about/tutorial/build-mongodb-on-linux/