How to compile in Puppy 4.1.2

Took me a while to find out how to do this. But it's all explained in this post. Actually some further detail is available here too.
In essence the steps are:
1. Download the devx_xxx.sfs file for your Puppy version from here
2. Now download the sfs installer from here to a convenient folder (I used /root/my-applications)
3. Expand the sfs installer using tar -zxvf
4. Click on the sfsinstaller and just follow the instructions.
Easy!!