+ dnl We don't use AC_FUNC_ERROR_AT_LINE any more, because it is no longer
+ dnl maintained in Autoconf and because it invokes AC_LIBOBJ.
+ AC_CACHE_CHECK([for error_at_line], [ac_cv_lib_error_at_line],
+ [AC_LINK_IFELSE(
+ [AC_LANG_PROGRAM(
+ [[#include <error.h>]],
+ [[error_at_line (0, 0, "", 0, "an error occurred");]])],
+ [ac_cv_lib_error_at_line=yes],
+ [ac_cv_lib_error_at_line=no])])
+])
+
+# Prerequisites of lib/error.c.
+AC_DEFUN([gl_PREREQ_ERROR],
+[
+ AC_REQUIRE([AC_FUNC_STRERROR_R])
+ AC_REQUIRE([AC_C_INLINE])
+ :