archiving error [make (e=87): The parameter is incorrect.]

"John Lee \(GMI\)" <[email protected]> Fri, 3 Jun 2011 21:26:31 +0800

Newsgroups	gmane.comp.gnu.make.windows
Message-ID	<!&!AAAAAAAAAAAYAAAAAAAAAOm8iWJ0ChRApu9T82wC2l7CgAAAEAAAALUG86TZrEpEk+EDct7KMBABAAAAAA==@goodmind.com.tw>

Hi all, i have problem with archiving *.o 
the error message after
ar -rcs libmylib.a [lots of *.o]
it gives error
make (e=87): The parameter is incorrect.
 
any idea how to solve this?
 
John

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