Eqn 1.19.2 Broken on MacOS X 10.5?

[Sarah]

Hi,

Does anyone happen to know if the eqn that ships with MacOS 10.5 is,
well, completely broken? Or am I doing something very basic wrong?

720$ cat eqn.in
.EQ
x=y+z
.EN

721$ eqn <eqn.in
.if !'\*(.T'ps' .if !'\*(.T'html' .tm warning: eqn should have been
given a `-T\*(.T' option
.if '\*(.T'html' .if !'ps'ps' .tm warning: eqn should have been given
a `-Tps' option
.if '\*(.T'html' .if !'ps'ps' .tm warning: (it is advisable to invoke
groff via: groff -Thtml -e)
.lf 1 /usr/share/groff/1.19.2/tmac/eqnrc
.\" Startup file for eqn.
.EQ
.nr 0C \n(.C
.cp 0
.ds 10
.cp \n(0C
.lf 63
.EN
.lf 1 -
.EQ
.nr 0C \n(.C
.cp 0
.ds 10
eqn:<standard input>:2: syntax error
.cp \n(0C
.lf 3
.EN

 context is
        >>> x=y+z <<<

722$ eqn -v
GNU eqn (groff) version 1.19.2

The same file works ok on a Solaris box, and on an Ubuntu 8.04 machine
running groff 1.18.1.

Is there a simple fix for this, other than installing and/or building
a separate copy of eqn?

Thanks,

Sarah