File xstereograph-2.1-libpng16.patch of Package xstereograph

Index: stereograph-0.28a/gfxio.c
===================================================================
--- stereograph-0.28a/gfxio.c
+++ stereograph-0.28a/gfxio.c
@@ -20,6 +20,7 @@
 
 #include <stdio.h>
 #include <stdlib.h>
+#include <string.h>
 #include <png.h>
 #include <math.h>
 #include <time.h>