In Mac OS X 10.11, Apple removed the OpenSSL headers from /usr/include/openssl. To work around this removal, we have added ABI compatible headers into /opt/mongodbtoolchain/v2/include. Scons needs to be updated to use these headers to ensure MongoDB continues to build after the underlying Mac OS X images are updated.
Example:
scons CPPPATH=/opt/mongodbtoolchain/v2/include