I just built and installed gcc6.3.0 for MATLAB, but I can't set the path to it. I tried

export PATH=/home/mo/GCC-6.3.0:$PATH

but this still gives the path to default gcc9.3.0. Ubuntu20.04.

5

2 Answers

You would have to update the gcc configuration to make that your default compiler.

Add the compiler to the list of available compilers.

sudo update-alternatives --install /usr/bin/gcc gcc /path/to/installation/bin/gcc-6.3 6

Activate the compiler. This will prompt you to select a compiler.

sudo update-alternatives --config gcc

Verify whether the changes have taken effect with gcc --version

For security reasons, it is not recommended to add directories especially to the beginning of the path, as explained in this answer.

2

An easy way for me was to export gcc's path in terminal as:

export PATH=/home/mo/GCC-6.3.0/bin:$PATH

and then open MATLAB from this terminal window as:

cd /usr/local/MATLAB/R2019a/bin ./matlab

check gcc path in MATLAB:

!which gcc

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