Description of problem:

Including stdlib.h and sys/wait.h in the "wrong" order produces conflicting types.

Version-Release number of selected component (if applicable):

glibc-headers-2.11.90-7.x86_64

How reproducible:

Always.

Steps to Reproduce:
1. $ cat t.c 
#include <stdlib.h>
#include <sys/wait.h>

2. gcc -c t.c
  
Actual results:

In file included from t.c:3:
/usr/include/sys/wait.h:67: error: conflicting types for ‘__WAIT_STATUS’
/usr/include/stdlib.h:72: note: previous declaration of ‘__WAIT_STATUS’ was here
In file included from /usr/include/sys/wait.h:81,
                 from t.c:3:
/usr/include/bits/waitstatus.h:68: error: redefinition of ‘union wait’

Expected results:

t.c being compiled.

Additional info:

Switching the order of the includes to read:

#include <sys/wait.h>
#include <stdlib.h>

makes things compile as workaround.
But I don't believe order should matter here.