From owner-freebsd-emulation@FreeBSD.ORG  Tue Jan  4 21:56:44 2011
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Date: Tue, 04 Jan 2011 13:31:12 -0800
From: Yuri <yuri@rawbw.com>
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Subject: Is Linux emulator not up-to-date and doesn't understand
 STB_GNU_UNIQUE binding?
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I have the working app in Ubuntu.
When I copy it to FreeBSD with all shared libs I get such message:
app.linux: symbol lookup error: ../lib/libstdc++.so.6: undefined symbol: 
_ZNSt7num_getIcSt19istreambuf_iteratorIcSt11char_traitsIcEEE2idE, 
version GLIBCXX_3.4

../lib/libstdc++.so.6 has been taken from Ubuntu (gcc-4.5.1)

Upon closer inspection I see that on FreeBSD:
 > readelf -aW ../lib/libstdc++.so.6 | grep 
_ZNSt7num_getIcSt19istreambuf_iteratorIcSt11char_traitsIcEEE2idE
   1426: 000f30dc     4 OBJECT <OS specific>: 10 DEFAULT   26 
_ZNSt7num_getIcSt19istreambuf_iteratorIcSt11char_traitsIcEEE2idE@@GLIBCXX_3.4 

   3380: 000f30dc     4 OBJECT <OS specific>: 10 DEFAULT   26 
_ZNSt7num_getIcSt19istreambuf_iteratorIcSt11char_traitsIcEEE2idE

But on Ubuntu the word 10 is replaced with UNIQUE. It refers to the 
relatively newly introduced extension STB_GNU_UNIQUE, see here:
http://osdir.com/ml/general/2009-08/msg09809.html

Should Linux emulator be updated?

Yuri