Have someone install "IITB Simplecpp in mac"?

I am trying to install simplecpp from this website "https://www.cse.iitb.ac.in/~ranade/simplecpp/" I am following the mac version. but when I try to cp file "/usr/include/xlocale.h ./" it gives an error "cp: /usr/include/xlocale.h: No such file or directory" Please, someone, install and tells me if I am doing wrong or there is an error with the commands given in the website.