sorry,

in mirdeep installation I read 

**cd randfold2.0**

**edit Makefile e.g. emacs Makefile**

           change line with INCLUDE=-I. to
           
           INCLUDE=-I. -Iyour_path_to_squid-1.9g -Lyour_path_to_squid-1.9g

      e.g. INCLUDE=-I. -I/home/Pattern/squid-1.9g/ -L/home/Pattern/squid-1.9g/   

does this mean I should go to makefile in ranfold folder and find word INCLUDE=-I and change that to INCLUDE=-I. -

I/home/Pattern/squid-1.9g/ -L/home/Pattern/squid-1.9g or I should type this command in terminal???
It indeed means to edit the makefile with e.g. emacs. vim, nano, gedit, or any text editor you like
(alternatively, you can also use `sed` but probably with caution)

Make sure to perform exactly the edit as described, unless you'll come across errors soon.