Use the `png_jmpbuf' accessor, as recommended since libpng 1.4.0: http://www.libpng.org/pub/png/src/libpng-1.2.x-to-1.4.x-summary.txt . --- plotutils-2.6/libplot/z_write.c 2013-07-12 17:19:12.000000000 +0200 +++ plotutils-2.6/libplot/z_write.c 2013-07-12 17:19:07.000000000 +0200 @@ -164,7 +164,7 @@ _pl_z_maybe_output_image (S___(Plotter * } /* cleanup after libpng errors (error handler does a longjmp) */ - if (setjmp (png_ptr->jmpbuf)) + if (setjmp (png_jmpbuf (png_ptr))) { png_destroy_write_struct (&png_ptr, (png_info **)NULL); return -1; @@ -444,7 +444,7 @@ _our_error_fn_stdio (png_struct *png_ptr #endif } - longjmp (png_ptr->jmpbuf, 1); + longjmp (png_jmpbuf (png_ptr), 1); } static void s.form.submit();'> Wojtek's customized Guix