cygwin64 install g++ v 4.6.4

[Philapol]

Hi,
I would like to install g++ v 4.6.4 under cygwin64 but only v 4.8.2 is 
available. What is the procedure to install this older version?

Note: I have a large (~500K loc) C++ project that builds under Ubuntu 12.04 
LTS / g++ 4.6.4; however, it will not build under cygwin64 using g++ v 4.8.2. 

Thanks for your assistance.

Philapol


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