I wish to install gcc 4.7 so that I can use some c++11 features.
I downloaded the source, ran ./configure and was told I needed GMP. Downloaded the code for that, hit ./configure and was told I needed m4. But I already have m4 (least that is what synamptic tells me).
What is going on and how can I fix it?
4 Answers
You can try this PPA for installing gcc 4.7. Do note that it has packages only for 12.04 and not for 11.10.
Run the following commands in a terminal:
sudo add-apt-repository ppa:ubuntu-toolchain-r/test
sudo apt-get update
sudo apt-get install gcc-4.7
Or, if you prefer a graphical way of installing a PPA, take a look at What are PPAs and how do I use them?.
NOTE!!
You also most likely need to take care of g++-4.7
So the full commands list will be:
sudo add-apt-repository ppa:ubuntu-toolchain-r/test
sudo apt-get update
sudo apt-get install gcc-4.7 g++-4.7
Also, don't forget to update-alternatives, as suggested here
sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-4.6 60 --slave /usr/bin/g++ g++ /usr/bin/g++-4.6
sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-4.7 40 --slave /usr/bin/g++ g++ /usr/bin/g++-4.7
sudo update-alternatives --config gcc
This is confirmed to work in Ubuntu 12.04
Search the build directory for config.log files, and search those for the error message. That should give some clues.
BTW, if you don't need 4.7 precisely, you could try installing the gcc-snapshot package. That should have the features you need. It doesn't get installed in the standard place though, if I remember correctly.
This is a complete guide of how to build from sources gcc-4.7 on Ubuntu 12.04 64 bits:
