Install g++ 4.9 on Mint 17.2 - c++

Question

I'm trying to install g++ 4.9 or greater in order to build mapbox on Android. The instructions state I need g++ 4.9 or greater. I found the following instructions, but they don't work.
sudo add-apt-repository ppa:ubuntu-toolchain-r/test
sudo apt-get update
sudo apt-get install g++-4.9
The last command says:
~ $ sudo apt-get install g++-4.9
Reading package lists... Done
Building dependency tree
Reading state information... Done
Package g++-4.9 is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source
E: Package 'g++-4.9' has no installation candidate
I also tried from Synaptic Package Manager and got the following:
g++:
Depends: cpp (>=4:4.9-1ubuntu7) but 4:4.8.2-1ubuntu6 is to be installed
Depends: gcc (>=4:4.9-1ubuntu7) but 4:4.8.2-1ubuntu6 is to be installed
Depends: g++-4.9 (>=4.9) but it is not installable
Depends: gcc-4.9 (>=4.9) but it is not installable
How can I get g++ 4.9 on my computer?
Thanks.

Answer 1

Here is how to install g++-4.9 on Linux Mint 17.2 Rafaela
Go to menu -> Administration -> Software sources
Click on Additional repositories and then Getdeb
Click on Edit URL...
Replace deb http://archive.getdeb.net/ubuntu trusty-getdeb apps
by
deb http://archive.getdeb.net/ubuntu wily-getdeb apps
and click on Update the cache
At this point you can go with
sudo add-apt-repository ppa:ubuntu-toolchain-r/test
sudo apt-get update
sudo apt-get install g++-4.9
You can invoke your g++ like this:
g++-4.9
Now you have g++ 4.9.3 installed
And as an add, you can have the latest g++-5 (g++ 5.2.1) compiler
sudo apt-get install g++-5