PostgreSQL 7.2 with AIX 4.3.3

I am unable to compile PostgreSQL 7.2 on an RS/6000, running AIX 4.3.3. I am using gcc version 3.2, and gmake version 3.79.1. I ran configure with the following options, according to FAQ_AIX:

--with-CC=gcc --with-includes=/usr/local/include --with-libraries=/usr/local/lib

I also tried to compile with the --with-template=aix, but it made no difference. Below is the tail of the output from gmake:

pqcomm.c: In function `StreamConnection':
pqcomm.c:398: warning: passing arg 3 of `naccept' from incompatible pointer type

pqcomm.c:417: warning: passing arg 3 of `ngetsockname' from incompatible pointer
type
pqcomm.c:428: `TCP_NODELAY' undeclared (first use in this function)
pqcomm.c:428: (Each undeclared identifier is reported only once
pqcomm.c:428: for each function it appears in.)
gmake[3]: *** [pqcomm.o] Error 1
gmake[3]: Leaving directory `/usr/local/src/postgresql-7.2/src/backend/libpq'
gmake[2]: *** [libpq-recursive] Error 2
gmake[2]: Leaving directory `/usr/local/src/postgresql-7.2/src/backend'
gmake[1]: *** [all] Error 2
gmake[1]: Leaving directory `/usr/local/src/postgresql-7.2/src'
gmake: *** [all] Error 2