Software compatibility

Hi I have built my own firmware for an unsupported target and i have issues downloading software becauses of differences in kernel etc from the online sources.

is there a way to sort all this out soi dont have to rebuild all the time to install a new package ?

I'm guessing i have to download tar of the release candidate apply my mods and then build as i have just applied patches to master

In that case you'll have to build everything from source yourself, especially kernel dependencies are very tight and only match within the same build.