-#AC_CHECK_HEADERS(obstack.h, ac_obstack_headers="yes", ac_obstack_headers="no")
-#if test "$ac_obstack_headers" != yes; then
-if test "$ac_cv_func_obstack" != "yes"; then
+AC_CHECK_HEADERS(obstack.h, ac_obstack_headers="yes", ac_obstack_headers="no")
+if test "$ac_obstack_headers" != yes; then