ly driven by
     <code>*-*-aix*</code>.  It might be more reliable to do some sort of
     feature test, examining the compiler output perhaps.  It might also be
     nice to merge the aix.m4 files into powerpc-defs.m4.
<li> config.m4 is generated only by the configure script, it won't be
     regenerated by config.status.  Creating it as an <code>AC_OUTPUT</code>
     would work, but it might upset "make" to have things like <code>L$</code>
     get into the Makefiles through <code>AC_SUBST</code>.
     <