This package includes freeware Unrar C++ source and a few makefiles (makefile.bcc, makefile.msc+msc.dep, makefile.unix).

Unrar source is subset of RAR and generated from RAR source automatically, by a small program removing blocks like '#ifndef UNRAR ... #endif'.

Such method is not perfect and you may find some RAR related stuff unnecessary in Unrar, especially in header files.