fix: noconfirm auto-selects first AUR match

local/recipes/dev/bison/source/m4/obstack-printf.m4

@@ -0,0 +1,41 @@
+# obstack-printf.m4 serial 4
+dnl Copyright (C) 2008-2021 Free Software Foundation, Inc.
+dnl This file is free software; the Free Software Foundation
+dnl gives unlimited permission to copy and/or distribute it,
+dnl with or without modifications, as long as this notice is preserved.
+
+dnl From Eric Blake.
+dnl Test whether obstack_printf() exists.  For now, we assume that
+dnl obstack_vprintf behaves identically, so we only test for one.
+
+AC_DEFUN([gl_FUNC_OBSTACK_PRINTF],
+[
+  dnl Persuade glibc <stdio.h> to declare obstack_printf(), obstack_vprintf().
+  AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])
+
+  AC_REQUIRE([gl_STDIO_H_DEFAULTS])
+  AC_CHECK_FUNCS_ONCE([obstack_printf])
+  if test $ac_cv_func_obstack_printf = no ; then
+    gl_REPLACE_OBSTACK_PRINTF
+  fi
+
+  gl_DECL_OBSTACK_PRINTF
+])
+
+AC_DEFUN([gl_REPLACE_OBSTACK_PRINTF],
+[
+  AC_REQUIRE([gl_STDIO_H_DEFAULTS])
+  if test $ac_cv_func_obstack_printf = yes; then
+    REPLACE_OBSTACK_PRINTF=1
+  fi
+])
+
+dnl Ensure obstack_printf() and obstack_vprintf() are declared
+dnl (whether or not they are being replaced).
+AC_DEFUN([gl_DECL_OBSTACK_PRINTF],
+[
+  AC_CHECK_DECLS_ONCE([obstack_printf])
+  if test $ac_cv_have_decl_obstack_printf = no; then
+    HAVE_DECL_OBSTACK_PRINTF=0
+  fi
+])