How to compile updates to FCL packages?

[CCRDude]

I've recently worked on a TRegistry patch, and want to continue this a bit more comfortably.

Simply adding the path to the fcl folder to a Lazarus project works for a moment, but then causes havoc (others units depending on the changed unit can't be compiled, everything stops). Doesn't look like the intended way anyway

How is the regular procedure to update fcl packages?

• I went to the shell and into the folder and called fpcmake and make, but unit System wasn't found.
• Calling make from the main fpcsrc folder doesn't give me an option to select single packages.
• Building all from main fpcsrc folder requires 3.0.0, but then tells me there's nothing to be done for 'all'.

Before I try further and find something that works, but is way out of the regular way, could anyone describe what's the "official" method please?

[Leledumbo]

I simply cd to source/packages/<whatever package I want to rebuild> and make, if system unit is not found then do the same to source/rtl folder (just make, no make install needed). If a lot of other packages require your changes, you can instead do make in source/packages to rebuild all packages.