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tclap is written in ANSI C++ and is meant to be compatible with any standards-compliant C++ compiler. The library is implemented entirely in header files making it easy to use and distribute with other software.
It implies that this package is almost empty. The actual content, i.e., the header files, are provided by the development package.
tclap is now a mature, stable, and feature rich package. It probably will not see much further development aside from bug fixes and compatibility updates.