If you install a new version, old lib (if there are not in the old thing directory) will be overwrited... but this is not a problem as long you keep the old-thing directory... if it compiled right the first time, why may you have problem compiling it a second time (well.. of course... sometime...). Keep the old one for some time 'til you get sure everything is working fine, the get the rid off (rm -rf hehe) the old stuff
I really like tar.gz because I can really know where thing are installed inside my computer... packages will install their stuff anywhere... tar.gz let you the choice
How do I find out if a certain package ( openssh for example ) is complied statically or not? I upgraded my openssl libraries and I read somewhere in this forum that I may need to recomplie openssh if it is statically compiled.
Well, when you "compile" every progs instead of using a paxckage manger, you habitually remember what's the option you choose the first time especially if these option are not habitual.