Clue is not a super polished piece of software, so running it (and the code it generates) requires a bit of setup.
clue itself is installed to
/opt/clue. To run the compiler, go to
/opt/clue, where a program can be compiled like
./bin/clue -mc test/helloworld.c >compiled.c
This sample line compiles C to C. Running programs compiled by
clue is done from
/opt/clue using the
./cluerun -f compiled.c
Which will compile
gcc and run the resulting executable.