You will need to clone the code from github. Git will create a new folder of MFM, so you don't need to make a new directory.
git clone https://github.com/DaveAckley/MFM.git
After the clone is done, a new directory is created: /home/user/MFM. The 'user' is your account name.
Now you can install the MFM. Go to the /home/user/MFM/. Type the make command.
If it throws out errors, there may be some dependencies lacked that caused these errors. Go to the install SDL section of Clone from github to check these packages are installed.
Go to the /home/user/MFM/. Type the mfms command.
The Movable Feast Machine should show up.