Add a Makefile; allow compiling on OS X. OS X requires <unistd.h> for the declarations of sleep() and usleep(), and also requires libc++ instead of libstdc++. Add -W -Wall and remove a few unused variables.
Add a Makefile; allow compiling on OS X.
OS X requires <unistd.h> for the declarations of sleep() and usleep(), and also requires libc++ instead of libstdc++.
Add -W -Wall and remove a few unused variables.
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