error building gcc on aix 4.3.2.0

[John Baxter]

I am having problems building gcc 2.95.3 on aix 4.3.2.0.
When I run 'make bootstrap', I get a parse error, in stdio.h:379
#if defined(_ALL_SOURCE) || _XOPEN_SOURCE == 500

It appears that while _XOPEN_SOURCE is defined, it is not defined as any
value.
In standards.h the line is #define _XOPEN_SOURCE

Should I change it to #define _XOPEN_SOURCE 500 in standards.h?

Thanks
John Baxter