rcsdiff in RCS version 5.7 seems broken

[R DeFuria]

Hello,

Yesterday, I (re)ran v 2.697 of Cygwin's setup.exe to update anything
that was out of date.

Among other things, it updated RCS.

Now, the rcsdiff command no longer works on my box:
     Dell Precision WorkStation 390 running Windows Vista Business
(x64) Service Pack 2

Here are the symptoms:
     $ rcsdiff test.txt
     ===================================================================
     RCS file: RCS/test.txt,v
     retrieving revision 1.1
     co: not found
     rcsdiff: RCS/test.txt,v: co failed

     $ echo $?
     2
*** n.b., ALL OTHER RCS COMMANDS WORK -- ci, co, rcsdiff, rlog, ...

Cygwin version is (ac. to the cygwin1.dll properties of "Product
version 1007.5.0" and modification date of "4/12/2010 1:09 PM"):
     Version 1.7.5

RCS version is (this matches cygcheck.out "rcs 5.7-10"):
     $ rcs -V
     RCS version 5.7

Sizes and dates of rcs exes are:
     $ ls -ltr `which rcs co ci rcsdiff`
     -rwxr-xr-x 1 rich root 71K 2010-05-20 15:57 /usr/bin/rcs*
     -rwxr-xr-x 1 rich root 66K 2010-05-20 15:57 /usr/bin/co*
     -rwxr-xr-x 1 rich root 70K 2010-05-20 15:57 /usr/bin/ci*
     -rwxr-xr-x 1 rich root 48K 2010-05-20 15:57 /usr/bin/rcsdiff*

cygcheck.out is attached.

-RD
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