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diff --git a/pixel.c b/pixel.c
--- a/pixel.c
+++ b/pixel.c
@@ -19,6 +19,10 @@
#include <fcntl.h>
#include "libg15render.h"
+#include <math.h>
+#include <stdlib.h>
+#include <unistd.h>
+
void
swap (int *x, int *y)
{
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