The installation of all the software is pretty straightforward and you will probably think it's so much easier and shorter to give the generic installation instructions for each package and only explain how to install something if a certain package requires an alternate installation method. Although I agree on that, I choose to give the full instructions for each and every package. This is simply to avoid any possible confusion and errors.
Now would be a good time to take a look at the optimization hint at http://hints.linuxfromscratch.org/hints/optimization.txt if you plan on using compiler optimization for the packages installed in the following chapter. Compiler optimization can make a program run faster, but may also cause some compilation problems. If you run into problems after having used optimization, always try it without optimizing to see if you can reproduce the problem.