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--- lcms-1.19/src/cmsio1.c.vanilla	2023-05-12 23:20:24.533079608 +0200
+++ lcms-1.19/src/cmsio1.c	2023-05-12 23:23:13.847091833 +0200
@@ -22,6 +22,9 @@
 
 // ICC profile serialization
 
+#define _XOPEN_SOURCE       /* See feature_test_macros(7) */
+#include <unistd.h>
+#include <strings.h>
 
 #include "lcms.h"