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I have gcc 7.3.0 on Ubuntu 18.04. But I am working on a project where I need gcc less than version 6. When I tried to install gcc 5.4 using sudo apt install gcc-5.4, I got this error:

Reading package lists... Done
Building dependency tree       
Reading state information... Done
E: Unable to locate package gcc-5.4
E: Couldn't find any package by glob 'gcc-5.4'
E: Couldn't find any package by regex 'gcc-5.4'  

What is the appropriate way to install gcc 5.4?

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  • 1
    Try just sudo apt install gcc-5 Oct 25 '18 at 14:24
  • 1
    try to find it with apt search gcc-5 or apt search gcc-6 Oct 25 '18 at 14:25
  • @steeldriver the command worked for me, but when I run gcc --version, I still get 7.3.0
    – singrium
    Oct 25 '18 at 14:29
  • 1
    That's normal - the symlink /usr/bin/gcc will still point to gcc-7. You can either change the symlink (manually - or via update-alternatives) or simply call gcc-5 explicitly when you need it Oct 25 '18 at 14:40
  • @steeldriver, thank you, it worked. Please post an answer and don't forget to include the update-alternatives
    – singrium
    Oct 25 '18 at 15:09
11

Thanks to @steeldriver, I could solve the problem as following:

Install gcc and g++

sudo apt install g++-5
sudo apt install gcc-5

Change the symlink to point to gcc 5 and g++ 5

sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-5 10
sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-5 20
sudo update-alternatives --install /usr/bin/g++ g++ /usr/bin/g++-5 10
sudo update-alternatives --install /usr/bin/g++ g++ /usr/bin/g++-5 20
sudo update-alternatives --install /usr/bin/cc cc /usr/bin/gcc 30
sudo update-alternatives --set cc /usr/bin/gcc
sudo update-alternatives --install /usr/bin/c++ c++ /usr/bin/g++ 30
sudo update-alternatives --set c++ /usr/bin/g++

Credits: How to choose the default gcc and g++ version?

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