update GCC from 4.8 to 4.9 for FileZilla3.16 Client on Ubuntu14.04

$gcc -v

sudo add-apt-repository ppa:ubuntu-toolchain-r/test
sudo apt-get update
sudo apt-get install gcc-4.9 g++-4.9
sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-4.9 60 --slave /usr/bin/g++ g++ /usr/bin/g++-4.9

ano@ano-svr1:~/Downloads/FileZilla3/bin$ ./filezilla
./filezilla: /usr/lib/x86_64-linux-gnu/libstdc++.so.6: version `CXXABI_1.3.8' not found (required by ./filezilla)
./filezilla: /usr/lib/x86_64-linux-gnu/libstdc++.so.6: version `GLIBCXX_3.4.20' not found (required by ./filezilla)

[1]http://askubuntu.com/questions/466651/how-do-i-use-the-latest-gcc-on-ubuntu-14-04