Solved: man on Centos 6 | Experts Exchange

makewhatis is part of the man package Try installing man.

yum info man
Name        : man
Arch        : x86_64
Version     : 1.6f
Release     : 32.el6
Size        : 389 k
Repo        : installed
From repo   : base
Summary     : A set of documentation tools: man, apropos and whatis
URL         : http://primates.ximian.com/~flucifredi/man/
License     : GPLv2
Description : The man package includes three tools for finding information
            : and/or documentation about your Linux system: man, apropos, and
            : whatis. The man system formats and displays on-line manual pages
            : about commands or functions on your system. Apropos searches the
            : whatis database (containing short descriptions of system commands)
            : for a string. Whatis searches its own database for a complete
            : word.
            :
            : The man package should be installed on your system because it is
            : the primary way to find documentation on a Linux system.

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