Problem installing on AIX 4.2

I am trying to compile Postgresql 6.4 on an RS/6000  model 380 running AIX
4.2

For a compiler and make utility I am using GNU version 2.8

I have been able to run the configure script without any apparent problems
but when I
try to execute the command

     gmake all >& make.log &

I get the following error message:

KSH: make.log 0403-007 Generated or received a file descriptor number that
is not
valid

I am stumped.

        Elliot Jaspin
        ElliotJ@coxnews.com