>> "Achim" == Achim Gratz <Stromeko@nexgo.de> writes:

   >> 
   >> when executed in Xemacs returns Xemacs, when executed in GNU emacs
   >> returns GNUS.

   > Yes, but the byte-compiler has to compile both branches, since the
   > if is actually resolved at run-time.  You'd need to use a
   > compatibility macro to make that decision at compile-time and only
   > use the XEmacs branch.  That was once in Org, but later reverted by
   > Bastien.

Ok, maybe this is off topic, but what would be a correct construction, I
am asking since my changes to icalendar.el suffer from the same mistake.

BTW I still do not understand why manual byte-compiling works, while
make does not.

Uwe