I tried an install.pl --all on this distro.

The ibacm module fails to build with undefined references to 
__sync_fetch_and_add and __sync_fetch_and_sub.

I see these exist on newer distros, but they are not available on RHEL4.  ibacm 
is using this in its linux/osd.h file to define atomic_inc and atomic_dec.  

An alternative might be to use /usr/include/asm/atomic.h as this has atomic_inc 
and atomic_dec macros already defined.  I would also be more portable.

Todd Rimmer
Chief Architect 
QLogic Network Systems Group
Voice: 610-233-4852     Fax: 610-233-4777
[email protected]  www.QLogic.com
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