A (probably stupid) question about dependencies

[Daniele Margotti]

Hi list,
I have installed Mapserver several months ago.
Now, I want to update (configure, make & make install) some packages,
because there are new versions of them: GD, gdal, geo-shapelib, libjpeg,
libtiff, proj.4, and so on.
 
Do I have to "uninstall" the previous version of these libraries, or
installation automatically "covers" the old version?
And, most important, do I have to recompile Mapserver or does it
automatically use the new version of these libraries?
 
I have a Linux Red Hat 9.0.
 
Thank you,
    Daniele
 
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