Description of problem:
The automountd (version 3) is not working on x86_64 platform.
When building autofs-4.0.X from source the created binary is
not working either. To be more precise: Mounting takes place,
but expiring does not and there are error messages in the
syslog. Reason is in /usr/include/linux/auto_fs.h, lines 41-45:
#if !defined(__alpha__) && !defined(__ia64__)
typedef unsigned int autofs_wqt_t;
#else
typedef unsigned long autofs_wqt_t;
#endif
Here a macro should be checked, whether it's a 64 Bit architecture
and not particularly, which one.

Version-Release number of selected component (if applicable):
The header is part of glibc-kernheaders-2.4-8.29

How reproducible:
Build automountd from source on x86_64

Steps to Reproduce:
1. Build automountd from source
2. configure and start it
3. make autofs mount some directory, wait for expiry
    
Actual results:
auto-mounted filesystem does not get unmounted, instead
a message appears in the syslog about an unknown command.
Reason is the wrong size of the type like explained above.
Strange enough: Inside the kernel for x86_64, the type seems
to be 32 bit.

Expected results:
Mountpoint expires, no error message

Additional info:
automountd version 4 is not part of the RedHat distribution, but we
need it here for hierarchical mounts.