For mac users: gcc -Wno-all -arch i386 -o c4 c4.c https://news.ycombinator.com/item?id=8560127 https://news.ycombinator.com/item?id=8560127 You can compile it

For mac users: gcc -Wno-all -arch i386 -o c4 c4.c https://news.ycombinator.com/item?id=8560127 https://news.ycombinator.com/item?id=8560127 You can compile it on 64 bit OS X with clang's -m32 option and it should work. https://news.ycombinator.com/item?id=8559044 https://news.ycombinator.com/item?id=8559044