postgreSQL 7.0.2 with AIX 4.2.1

After a ./configure --withtemplate=aix_42 --with-CC=xlc --without-CXX ,
when i compiled postgreSQL 7.0.2 on IBM PowePC running AIX 4.2.1 with xlc
3.1.4 i got this error

xlc -I../../../include -I../../../backend -qmaxmem=16384 -qhalt=w -qsrcmsg
-qlanglvl=extended -qlonglong -I../..
- c float.c
269 | val = (0.0/0.0);
...................................a....
a - 1506-232 (W) Divisor for modulus or division operator cannot be zero.
make[3]: *** [float.o] Error 1
make[3]: Leaving directory `/postgreSQL/pgsql/src/backend/utils/adt'

Can some expert help me ?
Thanks.

Lorenzo Vallan
mailto:l(dot)vallan(at)inwind(dot)it