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KCalc is part of the kdeutils package within the KDE project and will normally be provided as part of a KDE installation. For more details about KDE visit http://www.kde.org.
KCalc is part of the KDE project http://www.kde.org/.
KCalc can be found in the kdeutils package on ftp://ftp.kde.org/pub/kde/, the main FTP 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.