The files ck*.* comprise C-Kermit.

ck*.c are the C language source files.
ck*.h are the header files.
ckprot.w is the "wart" source for the protocol state table.

ckermi.mss is the Scribe text formatter source for the Kermit User Guide
chapter on C-Kermit for Unix.

ckermi.doc is the plain-text documentation output from Scribe.

ckermi.mak is the makefile.  It should be renamed to "makefile".  Use the
makefile to build C-Kermit for your Unix system, giving the appropriate
command line argument to "make", e.g.

make bsd	(for Berkeley Unix)
make pcix	(for PC/IX)
make provx1	(for Pro-350 with Venix 1.0)

etc.  The make file produces a runnable program called "wermit".  You should
test it thoroughly before renaming it to "kermit".