CSLI postscript drawing macros.  Created by Emma Pease
(emma@csli.stanford.edu).  

These macros were originally created to draw the lines between nodes
in the trees created by the tree macros in lingmacros.sty.  They will
only work with dvips version 541 or later (by Tomas Rokicki available
on labrea.stanford.edu) but can be easily modified to be used with
earlier versions of dvips and slightly less easily modified for other
dvi to postscript convertors.

To install, place 

tree-dvips.pro

in the postscript header path for dvips. 

Problems:

Be wary of using page extraction programs such as dviselect as you may
accidently drop the special command loading the header file if you do
not include the first page.  dvips's own page selection commands will
keep the special.