--- pngconf.h.orig	2004-09-11 23:35:25.000000000 -0700
+++ pngconf.h	2004-09-11 23:35:52.000000000 -0700
@@ -260,8 +260,8 @@
      /* If you encounter a compiler error here, see the explanation
       * near the end of INSTALL.
       */
-         __png.h__ already includes setjmp.h;
-         __dont__ include it again.;
+#warning         __png.h__ already includes setjmp.h;
+#warning         __dont__ include it again.;
 #    endif
 #  endif /* __linux__ */