How to install gcc 5.3.1 in Ubuntu 18.04 LTS

I want to install CUDA 8 in my Ubuntu 18.04 which needs gcc 5.3.1. If I use sudo apt install gcc-5.3 g++-5.3 then it gives me the following error:

Reading package lists... Done
Building dependency tree
Reading state information... Done
E: Unable to locate package gcc-5.3
E: Couldn't find any package by glob 'gcc-5.3'
E: Couldn't find any package by regex 'gcc-5.3'
E: Unable to locate package g++-5.3
E: Couldn't find any package by glob 'g++-5.3'
E: Couldn't find any package by regex 'g++-5.3'

Can someone please guide me to install gcc 5.3.1? Thank you.

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