lyx and /user/local

[Robin Gerard]

Hello,
My question does not concern lyx only, but I have had experience
with lyx. 
I transfer the contents of /usr/local in another directory and and lyx
works fine.
Is it necessary to keep the directories lyx-1.1.6fix1, kde, xform,
xpm-3.4k or is it necessary just to run configure, make and make
install ?    
Thanks for your reply.
-- 
 Gerard