clockspeed and AIX 5.1 w/gcc

I would like to get clockspeed running on an AIX box but am having problems 
getting clockspeed.c to compile.  After noodling about, it appears that this is 
the root cause of my problems:

bash-2.05a# ./compile tryrdtsc.c
tryrdtsc.c: In function `main':
tryrdtsc.c:11: inconsistent operand constraints in an `asm'
tryrdtsc.c:12: inconsistent operand constraints in an `asm'

As I understand it, this is to determine if the machine has an unadjusted 
hardware clock, but the code itself isn't even compiling.

A) Has anyone sucessfully compiled clockspeed under AIX (with xlc or gcc)?
b) Does anyone recognize this error and how to fix it?

Thanks in Advance

John

-- 
John Peacock
Director of Information Research and Technology
Rowman & Littlefield Publishing Group
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Lanham, MD 20706
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fax 301-429-5747