Changing the locale directory

[Jean-Marc Lasgouttes]

Hello,

I have a program (www.lyx.org) in which I would like to change the
locale directory twice: bindtextdomain is called first at main() time
to set the locale directory to its hardcoded value; it is invoked
again later once the directory from which is running has been
investigated (the idea is to allow binary distributions to be
relocatable).

Unfortunately, I cannot get it to work on my stock redhat9. 

Is there something specific I am supposed to do to get this to work?
>From my reading of the bindtextdom.c source, the translation cache is
supposed to get invalidated when bindtextdomain is called and the
lyx.mo file should get re-read...

Any hint welcome.

JMarc