--- file_not_specified_in_diff	
+++ file_not_specified_in_diff	
@@ -, +, @@ 
--- a/src/uc2/formats/sk1/sk1objs/curvelow.c
+++ b/src/uc2/formats/sk1/sk1objs/curvelow.c
@@ -23,6 +23,7 @@ 
  */
 
 
+#include <stdlib.h> /* abs() */
 #include "math.h"
 // #include "X11/Xlib.h"
 #include "curvelow.h"