🚀 go-pugleaf

We are trying to get the latest version of TeX (C Version 2.93) running
on an IBM RT/PC under AOS 4.3 Release 2 (aka BSD 4.3 with NFS).  When
we get to the step of running initex the following happens:

    Script started on Tue Feb  7 16:44:35 1989
    isengard:26> ./initex ./plain.tex '\dump'
    This is TeX, C Version 2.93 (INITEX)
    (./plain.tex Preloading the plain format: codes, registers, parameters, fonts,
    more fonts, macros,
    ! Use of if@ doesn't match its definition.
    <inserted text> i
                     fus@
    <argument> ifus@ 
                     
    @if #1#2->csname expandafter if@ string #1
                                              #2endcsname 
    newif ...expandafter expandafter edef @if #1{true}
                                                      {let noexpand #1=noexpand ...
    [other similar troubles deleted]

Upon comparing the definition of \newif in plain.tex with the
definition on page 348 of 'The TeXbook' we noticed that a number of '='
were missing in the file.  Inserting these and rerunning initex results
in the same output.  Can any one on the net can  tell us what is going
wrong and how to correct it?  If you need any addtional information
please do not hesitate to contact me.  Thanks in advance.

Pao-Po Hou <hou@gondor.cs.psu.edu>     | Disclaimer: The opinions expressed are
The Pennsylvania State University      | my own, and should not be attributed
Department of Computer Science         | to anyone else, living or dead.
University Park, PA   16802            |