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diff -uNrp old/operations/common/matting-global.c new/operations/common/matting-global.c
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--- old/operations/common/matting-global.c	2012-04-02 23:15:26.000000000 +0200
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+++ new/operations/common/matting-global.c	2016-12-04 11:10:25.255103750 +0100
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@@ -19,6 +19,7 @@
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 #include "config.h"
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 #include <glib/gi18n-lib.h>
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 #include <math.h>
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+#include <stdlib.h>
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 #ifdef GEGL_CHANT_PROPERTIES
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