problem with trees

[Michael W. Daniels]

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The documentation says that everything in pstricks should work under plain 
TeX. So the following should be okay:

\input pstricks
\input pst-tree
\psset{levelsep=*0.75cm, treesep=0.75cm}
\pstree{\TR{S}}{
   \pstree{\TR{NP}}{
     \pstree{\TR{DP}}{
       \TR{this}}
     \pstree{\TR{N}}{
       \TR{cat}}}
   \pstree{\TR{VP}}{
     \pstree{\TR{V}}{
       \TR{meows}}}}
\bye

But instead, I get the following error:

(treetest.tex (C:\texmf-l\tex\generic\pstricks\pstricks.tex
`PSTricks' v97 patch 9  <1998/01/07> (tvz)
(C:\texmf-l\tex\generic\pstricks\pstricks.con))
(C:\texmf-l\tex\generic\pstricks\pst-tree.tex  v97 patch 3, 1997/09/24
(C:\texmf-l\tex\generic\pstricks\pst-node.tex  v97 patch 6, 1998/04/28))
! Undefined control sequence.
\pstree at vertlevelsepadjust ...te \@auxout
                                           {\string \pstree at levelsepad...
\pstree at vertical ...ertlevelsepadjust {#1}
                                           \fi \global \setbox \pstree...
<argument> \pstree {\TR {DP}}{\TR {this}}
                                           \pstree {\TR {N}}{\TR {cat}}
\pst at makenotverbbox ...\the \everypsbox #2
                                           }\ifnum \pst at mathflag >\z@ ...
<argument> ...pstree {\TR {N}}{\TR {cat}}}
                                           \pstree {\TR {VP}}{\pstree ...
\pst at makenotverbbox ...\the \everypsbox #2
                                           }\ifnum \pst at mathflag >\z@ ...
l.6 ...{VP}}{\pstree{\TR{V}}{\TR{meows}}}}

as if it can't find a definition for \@auxout. I looked, and none of the 
distribution's files seem to define this sequence, although it does appear 
in latex.ltx (the latex kernel).

So how do I use the levelsep=* feature in plain TeX?

--
Michael W. Daniels                  | "...I'm a doctor of history."
daniels at ling.ohio-state.edu         |    "You mean you study it."
Dept. of Linguistics                |      "I mean I make it better."
                                     |         -- Continuity Errors

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