If you run out of disk quota while compiling the 6.894 software, you may be able to place the object and library files in /tmp as follows:
% cd ~/6894-0.1
% make distclean
% mkdir /tmp/${USER}-build
% cd /tmp/${USER}-build
% ~/6894-0.1/configure
% make
Now your source is in ~/6894-0.1, but your object files and
executables are in /tmp/${USER}-build. You can run
multifinger by typing
% /tmp/${USER}-build/multifinger/multifinger