Upstream Centos 6 & 7 do not provide support for the full version of Samba 4. Packages available in the upstream repos are a crippled version of Samba 4 with many of the features associates with Active Directory disabled. The reason for this is detailed here: https://blog.cryptomilk.org/2014/07/09/samba-ad-dc-in-fedora-and-rhel/ A solution to provide Samba 4 active directory does not look to be forthcoming by viewing the Fedora project.
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To further development of support for Samba 4 on the Koozali SME Server, Samba 4 packages from Sernet were selected. These packages will not immediately install cleaning on SME 9 due to the customization of Centos associated with SME 9, so the Sernet packages where re-built for SME 9. Details of this rebuild along with a link to the rebuilt packages are located in the following bug report: http://bugs.contribs.org/show_bug.cgi?id=8075