[tech] install gcc via compile

gcc 4.8+ supports c++ 11

so its necessary to update it. (some R packages also need newer compiler)

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download the src file

also gmp mpfr mpc ppl cloog src files

decompress them all

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1. install in this order:

gmp mpfr mpc  ppl cloog gcc

configure with every --with-PkgsNeedInstallBeforeThisStep

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2. another scheme

mv all pkgs into gcc src dir without the version suffix

configure and make at a time!

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 set related ENV

http://gcc.gnu.org/install/prerequisites.html

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