Might be late in this post. I just recently tried installing FOG on CentOS 6.2. To get htmldoc to pass, you need to download/install the latest latest rpm for the OS.
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[]wget [url]http://pkgs.repoforge.org/rpmforge-release/[/url][URL=‘http://pkgs.repoforge.org/rpmforge-release/rpmforge-release-0.5.2-2.el6.rf.x86_64.rpm’]rpmforge-release-0.5.2-2.el6.rf.x86_64.rpm[/URL]
[]rpm -i [URL=‘http://pkgs.repoforge.org/rpmforge-release/rpmforge-release-0.5.2-2.el6.rf.x86_64.rpm’]rpmforge-release-0.5.2-2.el6.rf.x86_64.rpm[/URL]
[*]yum install htmldoc
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