Not complicated (just cd to the directory and type 'make install clean') but on a lower end machine its going to take a long time.
A good solution to speed up builds on old hardware is to setup distcc to use the parallel processing power of your other CPUs.
I have only had success in using matching architectures for this, so for example, a G3 host can use the processing power of G4s and G5s, but not an Intel. Either way, you can turn what could be an overnight compile into a few minutes with enough POWER.
If you match the GCC version (using Tigerbrew), you should be able to theoretically use distcc on an OS X PowerPC Mac to compile for a Linux/BSD PowerPC host.
My initial reason behind researching this was to allow my 1st Gen AppleTV to use the 8 cores in my Mac Pro to compile packages under OSMC/Debian in minutes instead of days