The version check doesn't work because 0ed1801bf4bd added #ifndef __APPLE__ to guard the code, so if you're using readline on OS X, that rl_variable_bind workaround won't work.

There are two alternatives:

1) convert ifndef to ifdef and add a check for the ``using_libedit_emulation`` variable.

    #ifdef __APPLE__
        if (using_libedit_emulation) {
            ...
    ...

looks like a common idiom in readline.c.


2) just skip the test if _READLINE_VERSION < 0x0603