Please use the forum if you intend trying a manual build using the source only (for V5R2M0 or before).
http://www.coraltree.co.uk/phpbb/index.php

If you are on V5R3M0 or above, follow the install instructions associated with the RNS_x.xx_OBJ.zip file.

NOTE:  Although the INSTALL provides you with customisation options, you are advised to use the defaults 
unless you are 100% sure of the options.