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Date: Mon, 05 Nov 2007 11:43:32 +0100
From: Kris Kennaway <kris@FreeBSD.org>
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To: Norberto Meijome <freebsd@meijome.net>
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Cc: FreeBSD Stable ML <freebsd-stable@freebsd.org>
Subject: Re: Understanding libpthread.so.2 undef reference error....
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Norberto Meijome wrote:
> Hi list,
> I'm using  7.0-BETA2 on my laptop. While building different ports, i am encountering messages like the following (in particular the last line, the others are only warnings)
> 
> /usr/bin/ld: warning: libstdc++.so.5, needed
> by /usr/local/lib/libicui18n.so.36, may conflict with
> libstdc++.so.6 
> 
> /usr/bin/ld: warning: libm.so.4, needed
> by /usr/local/lib/libicui18n.so.36, may conflict with libm.so.5
> 
>  /usr/bin/ld:
> warning: libm.so.4, needed by /usr/local/lib/libicui18n.so.36, may conflict
> with libm.so.5 
> 
> /usr/local/lib/compat/libpthread.so.2: undefined reference to
> `__malloc_lock' gmake[1]: 
> 
> I don't ever remember getting this error before. I am pretty sure i'm using only binaries built on this machine for 7.0... have I missed anything? what's the cause of this error?
> 
> FWIW, I have compat6x installed

You missed the "portupgrade -fa" step of the upgrade from 6.x to 7.x. 
Those errors come from binaries linked to both 6.x and 7.x libraries.

Kris