Postgres 6.4, gmake, d: command not found

Greetings,

I am having problems compiling Postgres 6.4.2 on Solaris 7.
I know, 6.4?, why aren't you using 7.1/7.2. Well, a number
of our clients still use 6.4. We will upgrade them to 7.1/7.2
later this year.

In the meantime, I have been given another development box
on which I need to install Postgres 6.4. I have the src tarball,
postgresql-6.4.2.tar. I have run configure and tried making,
using gmake all. The following error arises. Any ideas?

Thanks,

Eric

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gmake[2]: Entering directory
`/usr/share/src/pgsql/postgresql-6.4.2/src/backend/bootstrap'
d bootparse.y
gmake[2]: d: Command not found
gmake[2]: [bootparse.c] Error 127 (ignored)
grep -v "^#" boot.sed > sedfile
sed -f sedfile < y.tab.c > bootparse.c
/bin/sh: y.tab.c: cannot open
gmake[2]: *** [bootparse.c] Error 1
gmake[2]: Leaving directory
`/usr/share/src/pgsql/postgresql-6.4.2/src/backend/bootstrap'
gmake[1]: *** [bootstrap.dir] Error 2
gmake[1]: Leaving directory
`/usr/share/src/pgsql/postgresql-6.4.2/src/backend'
gmake: *** [all] Error 2