Creating libraries: Cannot make help

Hi all

I am trying to package a library in R 1.6.1 (Windoze XP).

I have read the document "Writing R extensions" and think I
have done things correctly (though apparently not).  I have
searched the mail archives for help to no avail.

I also posted a few days ago and thanks to Peter Dalgaard I have
managed to focus my search for errors.

I am trying to create a library in R.  I run the INSTALL
script and installing the R files in the library itself go
fine; the message is

  adding build stamp to DESCRIPTION
  installing R files

Indeed, after loading the library, I can use these files.
But creating the help is causing troubles:

  installing man source files
make[1]: Leaving directory
`/cygdrive/d/pkd/research/tweedie/libraries/R/<lib-name>'
make: *** [pkg-<lib-name>] Error 255
make: Leaving directory `/cygdrive/d/Programs/R/rw1061/src/gnuwin32'

*** Installation of <lib-name> failed ***

And so while the library files work, there is no help available.

Without knowing Perl or anything, I seem to have found the line in
the INSTALL script that causes things to die (line break added):

    if(system("make -C $R_HOME/src/gnuwin32 PKGDIR=$pkgdir
       RLIB=$library SAVE=$save $helpflags $makecmd-$pkgname")){

If I run this command in a Cygwin window, 

Creating libraries: Cannot make help

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