#optional; If you also want to build the PDF manual (but you don't need to, you will need an optional tool called rubber that compiles Latex into a PDF
I found that most of the tutorials from English speaking world is sometimes limited, especially for Asterisk 1.8. Hence, I started searching the tutorial in some non-English environment long time ago. The above information was mainly come from a French website, I also add additional information from another Korean and Japanese site with my own experience getting from many installation trial.
Umm….. you got me! Don't know what the hoard in depth. What I understand is that it can help speeding up Asterisk and dramatically improve application performance, especially for multithreaded programs running on multiprocessors and multicore CPUs.
Chan_nbs is network broadcast sound support channel driver. I think there is no harm to install it in Asterisk when it is related to sound driver and even don't know how it works behind.