Firstly, install gcc-4.8 with the command:

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$ sudo apt-get install gcc-4.8

Secondly, set the default gcc version:

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$ gcc --version 
# view the current gcc version

$ ls /usr/bin/gcc* 
# view the gcc versions that we have

$ sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-4.8 100
# Raise the priority of gcc-4.8 to 100

$ sudo update-alternatives --config gcc

That’s all. We can type in gcc --version again to make sure the version of gcc is degraded.

Just refer to the method of degrading gcc and replace all the ‘gcc’ with ‘g++’.

Type in the command:

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$ sudo apt-get install flex-old

It is mainly the problem of the version of flex, try degrading flex with the command:

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$ sudo apt-get install flex-old

It is the problem of access permission, just upgrade the privilege by:

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sudo chown -R $(id-un):$(id-gn) $WM_PROJECT_USER_DIR
echo $WM_PROJECT_USER_DIR

Type in the following command:

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$ sudo apt-get install python-numpy

Open the PyFoam folder and type in the command:

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sudo python setup.py install