This article is from the 3b1 computers FAQ, by John B. Bunch with numerous contributions by others.
The object-file archive format was changed from release 3.0 to 3.5 of the operating system. There is a utility to convert these archives to the new format.
# convert oldarchive.a newarchive.a
Or you can run:
# arconvert # file oldarchive.a newarchive.a oldarchive.a: 5.0 archive newarchive.a: 5.2 archive
That will convert all the archives in /usr/lib and /lib that are in the old 5.0 archive format to the new 5.2 archive format.
 
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