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I am trying to build a code from this website on linux. https://www2.eecs.berkeley.edu/Research/Projects/CS/vision/grouping/segbench/ When I run gmake install in the directory (as instructed), I get the following error below telling me to use gcc 4.7.x. 

Building with 'g++'.
Warning: You are using gcc version '4.8.4'. The version of gcc is not
supported. The version currently supported with MEX is '4.7.x'. For a list of
currently supported compilers see:
http://www.mathworks.com/support/compilers/current_release. 
Error using mex
In file included from

I have followed this thread to install gcc version 4.7.3 How to activate gcc 4.7 version? and have verified that my version of gcc 4.7.3 by typing gcc -v.

sudo apt-get install gcc-4.7
sudo rm /usr/bin/gcc
sudo ln -s /usr/bin/gcc-4.7 /usr/bin/gcc

So im not sure why its still trying to build with 4.8.4. Was hoping someone could help me out.

|improve this question
  • g++ is not the same thing as gcc (well, not in this context, at least) – steeldriver Feb 18 '17 at 3:50
  • 1
    . . . you likely need to install the corresponding g++-4.7.3 and either symlink that to /usr/bin/g++ or (less drastically - and how I would recommend) simply set appropriate variables CC=/usr/bin/gcc-4.7.3 and CXX=/usr/bin/g++-4.7.3 – steeldriver Feb 18 '17 at 4:05
  • Messing with the gcc symlink (et al.) is just asking for trouble. – fkraiem Feb 18 '17 at 5:41
  • hi steeldriver thanks for the help. I installed g++-4.7 then typed CXX=/usr/bin/g++-4.7 but g++ -v still says gcc version 4.8.4 while gcc -v says gcc version 4.7.3 – RuiQi Feb 18 '17 at 10:28

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