Jxktock.c is a program that renames the xk*.* files to ck*.* in the currentJdirectory, so that you can compile them with the Makefile, and so that theMinclude files will have the right names.  Compile xktock with your C compilerC(e.g. "cc -o xktock xktock.c") and then run it (e.g. "xktock xk*").EBefore doing this, you should have put all the xk* files in their owndirectory and cd'd to it.