makewhatis is part of the man package Try installing man.
yum info manName : manArch : x86_64Version : 1.6fRelease : 32.el6Size : 389 kRepo : installedFrom repo : baseSummary : A set of documentation tools: man, apropos and whatisURL : http://primates.ximian.com/~flucifredi/man/License : GPLv2Description : 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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