Turn off bash-completions by default, but leave the autoconf options in place

configure.ac

@@ -376,12 +376,13 @@ AS_IF([test "$with_libidn" != "no"],[
 
 # Bash completions
 AC_ARG_WITH([bash-completions],
-  AC_HELP_STRING([--with-bash-completions=[DIR]], [Bash completions directory [default=auto]]),
-  [with_bash_completions="$withval"],
-  [with_bash_completions=auto]
+  AC_HELP_STRING([--with-bash-completions=[DIR]], [Bash completions directory [default=no]]),
+  [AS_IF([test "$withval" = ""],
+    [with_bash_completions="yes"],
+    [with_bash_completions="$withval"])],
+  [with_bash_completions=no]
 )
 AS_CASE([$with_bash_completions],
-  [auto], [PKG_CHECK_VAR([bash_completions_dir], [bash-completion], [completionsdir])],
   [yes], [PKG_CHECK_VAR([bash_completions_dir], [bash-completion], [completionsdir], [], [AC_MSG_ERROR([bash completions not found])])],
   [no], [bash_completions_dir=],
   [bash_completions_dir="$with_bash_completions"]