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KFileReplace is part of the KDE project http://www.kde.org/.
KFileReplace can be found on the download site of the KDE project.
For detailed information on how to compile and install KDE applications see Building and Running KDE Software From Source
Since KDE uses cmake you should have no trouble compiling it. Should you run into problems please report them to the KDE mailing lists.
In order to use the command [$mathexp:
some_math_expression$] you should install the bc mathematical utility (version 1.06 or newer) written by Philip A. Nelson (