-AC_DEFUN([gl_HEADER_ERRNO_H],
-[
- dnl Use AC_REQUIRE here, so that the default behavior below is expanded
- dnl once only, before all statements that occur in other macros.
- AC_REQUIRE([gl_HEADER_ERRNO_H_BODY])
-])
-
-AC_DEFUN([gl_HEADER_ERRNO_H_BODY],
+dnl This macro must pass through AC_REQUIRE (never directly invoke it).
+AC_DEFUN_ONCE([gl_HEADER_ERRNO_H],