I need help building a Makefile in c++. Instructions are as follows. Compile & link main.cc & ll.cc together into an executable named link - This step is already completed This is the step I need help with. a Makefile so that you won't have to type g++ again. Use at least -Wall. Its default target must be link. That is, if you just type make, it will create an executable program called link. It is not acceptable to use a Makefile produced by cmake. That Makefile is tied to the directory you wrote it in, and so won't work for anybody else.