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to change gcc and g++ version used in MATLAB (I’m using R2017b on Ubuntu 16.04), first of all, install gcc-4.9 and g+±4.9 using

sudo apt-get install gcc-4.9 g+±4.9

to change version of gcc, run following command:

sudo gedit /usr/local/MATLAB/R2017a/bin/glnxa64/mexopts/gcc_glnxa64.xml

and replace Location="$GCC" with Location="/usr/bin/gcc-4.9"

to change version of g++, run following command:

sudo gedit /usr/local/MATLAB/R2017a/bin/glnxa64/mexopts/g++_glnxa64.xml

and replace Location="$G++" with Location="/usr/bin/g+±4.9"

To verify that changes is done correctly, run following command in MATLAB Command Windows:

for gcc

myCCompiler = mex.getCompilerConfigurations(‘C’,‘Selected’)

for g++

myCCompiler = mex.getCompilerConfigurations(‘C++’,‘Selected’)

I hope, it helps.

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