Description of problem:
I guess the problem would be best illustrated by a testcase:

$ cat pt.c 
#include <asm/ptrace.h>
$ gcc pt.c 
In file included from /usr/include/asm/ptrace.h:4,
                 from pt.c:1:
/usr/include/asm/ptrace-abi.h:92: error: expected specifier-qualifier-list
before ‘u32’

Causes problem during ltrace build.
The problem might be that u32 is wrongly exposed to userspace, or I guess that
it's left out from asm/types.h.

Version-Release number of selected component (if applicable):
kernel-headers-2.6.25-0.40.rc1.git2.fc9.x86_64
kernel-headers-2.6.25-0.65.rc2.git7.fc9.i386

How reproducible:
Always

Steps to Reproduce:
See description.
  
Actual results:
undefined type u32 is used

Expected results:
the type u32 is not used, or is defined