NetBSD/gnu/usr.bin/dc
..
array.c
COPYING
dc-number.c
dc-proto.h
dc-regdef.h
dc-version.h
dc.1
dc.h
dc.texinfo
eval.c
Makefile
misc.c
README.NetBSD
stack.c
string.c

This is GNU dc.  (Taken from the GNU bc 1.03 distribution.)

ALL other files distributed with GNU dc are available in some form in
/usr/src/gnu/usr.bin/bc.  (aka ../bc)

The files array.c, eval.c, misc.c, stack.c and string.c were renamed from
their original distribution names as dc-xxxx.c.

An original distribution of GNU bc/dc can be regenerated from the files
in the directories bc and dc.  (It will require GNU autoconf 2.0 to 
regenerate some files.)