I am very stubborn! I am having a go at it again! GRRR! There should be a time when I should give it up ... soon ... I hope.
Are you using ccache ?
No, I don't have it installed. The way I see it is when we get a good build and Dropbox it, Neal has to go over the whole process so I prefer to have a clean BUILD and BUILDROOT. But of course I don't have enough understanding of its advantages and maybe disadvantages.
It is very useful if you are going to recompile several time
the same source files, like when repeating package building ... every single source already compiled, if not changed, will get the result from the cache avoiding to recompile the same source ... ultimately it speed up the whole process ....

The final result doesn't change! (cons: you need 1 GB extra storage used to cache compiled files ...).
AS