Documentation of AC_ARG_WITH

[Reuben Thomas]

In the first example for AC_ARG_WITH, there's an "if test…fi" block:

    if test "x$with_readline" != xcheck; then
       AC_MSG_FAILURE(
         [--with-readline was given, but test for readline failed])
     fi

Is there some reason why this doesn't use AS_IF?

I see a comment above saying:

   @c FIXME: Remove AS_IF when the problem of AC_REQUIRE within `if' is
solved.

but it's not clear whether that's relevant (the commit log that introduced
the comment doesn't seem to explain it).

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