-#define _POSIX_C_SOURCE 1 /* struct sigaction, sigaction() */
-#include <ncurses.h> /* keypad() */
-#include <signal.h> /* struct sigaction, sigaction() */
+#define _POSIX_C_SOURCE 1 /* sigaction, sigaction() */
+#define _DARWIN_C_SOURCE 1 /* SIGWINCH on OS X */
+#include <ncurses.h> /* keypad(), start_color() */
+#include <signal.h> /* SIGWINCH, sigaction, sigaction() */