bug#12123:

[Eli Zaretskii <eliz@gnu.org>]

> From: Glenn Morris <rgm@gnu.org>
> Cc: 12123@debbugs.gnu.org,  yandros@MIT.EDU,  eggert@cs.ucla.edu
> Date: Sun, 07 Apr 2013 22:00:49 -0400
> 
> Eli Zaretskii wrote:
> 
> > Btw, even if these conditions _are_ true, I still don't see how can we
> > find /usr/libexec/emacs/VERSION/CONFIG/, /usr/share/emacs/VERSION/lisp/
> > using the fact that Emacs was invoked from /usr/bin/.  Which part of
> > the code knows about VERSION and CONFIG part and looks for them?  All I
> > see is that we look for lib-src and etc, but that's only good to detect
> > that we are being run from the build directory, not from where we are
> > installed.  What am I missing?
> 
> Well yes, that's the point of this report. No-one has implemented a
> relocatable Emacs installation for general POSIX platforms. Solving
> those problems is part of it. A relocatable Emacs would not be installed
> as you describe above, it would (I imagine) be installed similar to the
> way the NS build is, under a single top-level directory.

The example above is still under a single top-level directory, called
'/usr' (a.k.a. ${prefix}).  Relocating just means changing ${prefix}
after Emacs was built.