gentoo-overlay/sci-visualization/grace/files/grace-5.1.22-libpng15.patch

--- src/rstdrv.c
+++ src/rstdrv.c
@@ -53,6 +53,7 @@
 #endif
 
 #ifdef HAVE_LIBPNG
+#  include <zlib.h>
 #  include <png.h>
 #endif
 
@@ -885,7 +886,7 @@
         return;
     }
 
-    if (setjmp(png_ptr->jmpbuf)) {
+    if (setjmp(png_jmpbuf(png_ptr))) {
         png_destroy_write_struct(&png_ptr, &info_ptr);
         return;
     }