gentoo-overlay/sci-chemistry/molscript/files/2.1.2-libpng15.patch

--- png_img.c
+++ png_img.c
@@ -18,6 +18,7 @@
 
 #include <GL/gl.h>
 
+#include <zlib.h>
 #include <png.h>
 
 #include "clib/str_utils.h"
@@ -69,7 +70,7 @@
   info_ptr = png_create_info_struct (png_ptr);
   if (info_ptr == NULL)
     yyerror ("png_img: could not create PNG info structure");
-  if (setjmp (png_ptr->jmpbuf)) yyerror ("png_img: could not setjmp");
+  if (setjmp (png_jmpbuf(png_ptr))) yyerror ("png_img: could not setjmp");
 
   png_init_io (png_ptr, outfile);
   png_set_compression_level (png_ptr, compression_level);