Compile error: command not found

Hi all!

I downloaded 8.3.1 and ./configure and gmake went smoothly during the
installation process. But when I ran gmake install, I had these
errors:

**********
gmake[3]: Entering directory `/root/postgresql-8.3.1/src/backend/utils'
AWK='' /bin/sh Gen_fmgrtab.sh ../../../src/include/catalog/pg_proc.h
Gen_fmgrtab.sh: line 84: $5 == "12" { print }: command not found
Gen_fmgrtab.sh: line 142:
BEGIN   { OFS = ""; }
        { if (seenit[$(NF-3)]++ == 0) print "#define F_", $(NF-3), "
", $1; }: command not found
Gen_fmgrtab.sh failed
gmake[3]: *** [fmgroids.h] Error 1
gmake[3]: Leaving directory `/root/postgresql-8.3.1/src/backend/utils'
gmake[2]: *** [utils/fmgroids.h] Error 2
gmake[2]: Leaving directory `/root/postgresql-8.3.1/src/backend'
gmake[1]: *** [install] Error 2
gmake[1]: Leaving directory `/root/postgresql-8.3.1/src'
gmake: *** [install] Error 2

***********
and gmake stopped. Any ideas as to what I can do to fix this?

I'm running a recently installed Slackware Linux 12.0 on a linux-only box.

-- 
Regards,
Nathan Garlington