4.2 and Patches question

["Ryan Jay B. Lapuz" <rlapuz (at) fcpp.fujitsu.com>]

Hi guys,

I tried to add the all in one patch for hobbit 4.2.0 and it run smoothly 
when I issued the command
[root (at) hobbit hobbit-4.2.0]# patch -p0 <allinone.patch

So my next step would to re-configure, re-make and re-makeinstall, is this 
right?

Is my old configuration would be safe without backup if I'll do the next 
step?

Thanks in advance!

Regards,
Ryan