6.5beta1 compile fails

with the following message:

make -C utils all
make[1]: Entering directory `/user6/home/humphrey/pgsql/src/utils'
gcc -I../include -I../backend -Wall -Wmissing-prototypes -c version.c
-o ve
rsion.o
In file included from ../include/postgres.h:42,
from version.c:30:
../include/c.h:792: parse error before `va_list'
version.c: In function `ValidatePgVersion':
version.c:83: warning: subscript has type `char'
version.c:85: warning: subscript has type `char'
make[1]: *** [version.o] Error 1
make[1]: Leaving directory `/user6/home/humphrey/pgsql/src/utils'
make: *** [all] Error 2

The ./configure --with-template=svr4 seems to work fine. The reason I
try 6.5 is that 6.4.2 failed compilation on my AT&T System 3000 (ncr).
Please help!

Jun