make sure this compiles with aix

git-svn-id: svn://svn.oetiker.ch/rrdtool/trunk@1224 a5681a0c-68f1-0310-ab6d-d61299d08faa

diff --git a/program/src/pngsize.c b/program/src/pngsize.c
index 1705fc8cc7d14cf7d1c72300bcf85eeb1a331f00..59e2003f00c404722a5e13b519c28be0a72c948f 100644 (file)
--- a/program/src/pngsize.c
+++ b/program/src/pngsize.c
@@ -31,10 +31,14 @@ int PngSize(
 #undef jmpbuf
 #endif
 
-    if (setjmp(png_read_ptr->jmpbuf)) {
-        png_destroy_read_struct(&png_read_ptr, &info_ptr, (png_infopp) NULL);
-        return 0;
-    }
+#ifndef png_jmpbuf
+#  define png_jmpbuf(png_ptr)   ((png_ptr)->jmpbuf)
+#endif
+
+  if (setjmp(png_jmpbuf(png_read_ptr))){
+    png_destroy_read_struct(&png_read_ptr, &info_ptr, (png_infopp)NULL);
+    return 0;
+  }
 
     png_init_io(png_read_ptr, fd);
     png_read_info(png_read_ptr, info_ptr);