Building Emacs on AIX 5.2

[Harald Maier]

If I build emacs-21.3.50 on AIX 5.2 I get the following error:

,----
| $ gcc -c -D_BSD  -Demacs -DHAVE_CONFIG_H -DUSE_LUCID  \
|   -I. -I/usr/maierha/build/emacs/src -D_BSD -g -O -O2 process.c 
| process.c: In function `status_convert':
| process.c:412: error: request for member `w_status' in something 
|   not a structure or union
`----

,----
| $ uname -a
|   AIX msora1 2 5 0051F79F4C00
`----

As the error message reports the problem is caused by the union 'wait'
type (-D_BSD). If I undefine the _BSD macro in the file process.c then
all works fine. I don't know how to adjust this in the configure
setup.

Harald