Quick questions

[Lorenzo Bertini]

Hello list, just a couple of quick questions.
I wanted to get a meaningful output out of valgrind so i needed to build 
a debug version:

1. how do i tell autotools that i want this? I tried some LyX pages but 
they don't specifically say how. Is it the default behavior? In case, 
how do i get release output?

Also, on my computer i have debian 11 and LyX 2.3.6 as package. I have 
LyX 2.4 cloned from git on a folder:

2. how do i download the debug symbols for 2.4? The package lyx-dbgsym 
is for 2.3.6.
3. LyX 2.4 has overwritten something in the .lyx folder so LyX 2.3.6 
doesn't work anymore; how do i keep them separated?

Thank you kindly in advance,

Lorenzo (lynx on trac)