From owner-freebsd-questions@FreeBSD.ORG  Wed Dec 29 09:47:19 2010
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Date: Wed, 29 Dec 2010 01:47:18 -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 UNIQUE replaces 10. 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