man, info fail me in cygwin 1.5.18

[Rolf Maier]

Hello,
    I upgraded cygwin to 1.5.18(0.132/4/2) 2005-07-02 20:30 i686.
If I type 'man man' I get

Error executing formatting or display command.
System command (cd "/usr/share/man" && (echo ".ll 7.2i"; echo ".nr LL 
7.2i"; echo ".pl 1100i"; /usr/bin/cat '/usr/share/man/man1/man.1'; echo 
".\\\""; echo ".pl \n(nlu+10") | /usr/bin/tbl | /usr/bin/nroff -c 
-mandoc 2>/dev/null | /usr/bin/less -isrR) exited with status 127.
No manual entry for man

I did a 'makewhatis', yet 'man -k' still fails:

$ man -k man
Error executing formatting or display command.
System command '/usr/bin/apropos' 'man' exited with status 127.

    If I type 'info man' I get multiple listings to help on fftw3 and 
Octave,
and nothing else. Can anyone tell me what might have happened,
and hence what I need to fix?

Thanks in advance for any pointers,
    Rolf
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