Passing flags from compiler to linker

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I've been experiencing problems on Tru64 with several packages that won't
compile because of an unknown flag (-pthread) which seems to be passed by
libtool from the compiler (cc) to the linker (ld).
I'm having this problem right now trying to compile the latest apache2 on
tru64 5.1b, and the same exact thing happens on several other packages, such
as proftpd for example, and I've seen other people having this problem with
mysql, but haven't seen a fix or workaround yet.
How can I get around this problem without waiting for a new version to come
out or a patch to be available?

-- 
Didier Godefroy
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