Javascript files give "syntax error": not substituted?

I’m pretty new at RT. Just installed 3.6.4 on Linux FC4, MySQL, apache,
mod_perl. RT pretty much all works, except the JavaScript hide/show
stuff doesn’t. That seems to be because all the js files in
/rt/NoAuth/js use “%” as a comment char and seem to need some kind of
text-substitution. But they’re coming through unmodified to the client
side. Here’s one such error:

Error: syntax error
Source File: http://my.domain/rt/NoAuth/js/util.js
Line: 1
Source Code:
%# BEGIN BPS TAGGED BLOCK {{{

Are these files supposed to get processed on the server before getting
sent to the client? My httpd config is very simple (my RT runs in
http://my.domain/rt):

Alias /rt "/opt/rt3/share/html"
AddDefaultCharset UTF-8

PerlModule Apache::DBI
PerlRequire /opt/rt3/bin/webmux.pl
<Location /rt>
  RewriteEngine On
  RedirectMatch permanent (.*)/$ $1/index.html
  SetHandler perl-script
  PerlHandler RT::Mason
</Location>

So what have I misconfigured?

thx,

Gary Oberbrunner