From owner-freebsd-hackers@FreeBSD.ORG  Mon Feb  9 09:26:25 2015
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Date: Mon, 9 Feb 2015 10:18:34 +0100 (CET)
From: Wojciech Puchar <wojtek@puchar.net>
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Subject: FreeBSD/MIPS32: __sync_sub_and_fetch_4
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i'm getting undefined reference from some programs compiled on MIPS under 
FreeBSD/10

where can i find this procedures?