Buried in the link to gentoo are links to 2 Coin patches that allow
building against system expat:

 http://hg.sim.no/Coin/coin-3.1/raw-rev/06d276e6894e
 http://hg.sim.no/Coin/coin-3.1/raw-rev/ac55d7d433aa


----- Forwarded message from "Tom Fredrik Klaussen (JIRA)" 
<[email protected]> -----

Date: Tue, 12 Jan 2010 14:28:28 +0100 (CET)
From: "Tom Fredrik Klaussen (JIRA)" <[email protected]>
To: [email protected]
Subject: [JIRA] Commented: (COINSUPPORT-1151) Add configure option to use
        system expat library


    [ 
https://jira.sim.no/browse/COINSUPPORT-1151?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=21499#action_21499
 ] 

Tom Fredrik Klaussen commented on COINSUPPORT-1151:
---------------------------------------------------

Hi Steve

See
http://bugs.gentoo.org/show_bug.cgi?id=297644

I have solved some similar issues for them.

Best regards
Tom Fredrik

> Add configure option to use system expat library
> ------------------------------------------------
>
>                 Key: COINSUPPORT-1151
>                 URL: https://jira.sim.no/browse/COINSUPPORT-1151
>             Project: Coin Support
>          Issue Type: Improvement
>      Security Level: Private(only inhouse people can see these issues) 
>          Components: GPL
>            Reporter: Steve M. Robbins
>            Assignee: Tom Fredrik Klaussen
>            Priority: Minor
>         Attachments: signature.asc
>
>
> A bug has recently been filed against Coin in Debian 
> (http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=560928) due to a 
> vulnerability in the expat XML parsing library.  Coin embeds a copy of expat, 
> and may be vulnerable (I haven't checked).
> The question arises: is the Coin version of expat modified in some way, or 
> can Coin safely be linked to a system expat?  If the latter is true, it would 
> be convenient to expose this in a configure option.  This will protect us 
> from patching coin in future if another expat bug is discovered.
> Thanks,
> -Steve

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