Documentation on the command line utilities is here: Command-line tools summary
We recommend that you download and install libsmbios using the yum repository. Information on configuring your machine for this repository is here: Libsmbios package repository (yum)
Instructions on how to compile libsmbios from source is here: Compiling Libsmbios
All versions of libsmbios are available here, both older versions, plus new beta versions: