LinuxQuestions.org - Duplicate glib-2 and gtk

Dears Linux Questions:
I found this posted on another thread, but as nobody answered, I concluded that it was on the wrong place:

Quote:

Originally Posted by knudfl View Post
Glib-2.36.3 : Not a good idea to use "tomorrows version".
And some of your applications may not work with a version
different from the default installed.

Also searched on other places here LQ and on the WEB, but couldn't make a relevant conclusion:

I am installing pygobject, pycairo and pygtk on Slackware 10.1 - 2.6 Kernel
I've got installed two glib-2.0, one in:

/usr/lib/ (V:2.6)

and the other in:

/usr/local/glib2224 (V:2.22.4)

Tree little questions:

1) How should I export the PKG_CONFIG_PATH and the LD_LIBRARY_PATH?

2) Should them both have permanent settings?

3) May be the libraries coexist (2.6 and 2.22.4) or should them be unified? (replaced)
Regards.

Alejandro.