How to recompile 'gcc-4.9-4.9.2' package with different prefix?

[Valeriy Solovyov]

Hi,
I need recompile toolchain with new path '/opt/toolchain/4.9':

I can rebuild it with following shell commands, but how I can change all
--prefixes?:

apt-get build-dep -y gcc-4.9-multilib
apt-get source -y gcc-4.9-multilib

dpkg-source -x gcc-4.9_4.9.2-0ubuntu1~12.04.dsc
cd gcc-4.9-4.9.2
dpkg-buildpackage -rfakeroot -b



Thank you.
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