--- zvbi/configure.in   2013-08-28 13:52:48.000000000 +0000
+++ zvbi.patched/configure.in   2016-11-02 21:25:34.292580446 +0000
@@ -244,7 +244,7 @@
 dnl
 HAVE_PNG="yes"
 AC_CHECK_LIB(png, png_destroy_write_struct,
-  LIBS="$LIBS -lpng -lz", HAVE_PNG="no", -lz -lm)
+  LIBS="-lpng -lz $LIBS", HAVE_PNG="no", -lz -lm)
 if test "x$HAVE_PNG" = xyes; then
   AC_DEFINE(HAVE_LIBPNG, 1, [Define if you have libpng])
 fi