I have downloaded meta-flutter from https://github.com/jwinarske/meta-flutter.
I tried to build the recipes using the below commands,
$ source poky/oe-init-build-env build
build$ bitbake flutter-engine
But it give me the following error
(/poky/meta-flutter/recipes-graphics/flutter-engine/flutter-engine_git.bb:do_patch) failed with exit code '1'
I also tried building depo-tools manually (bitbake depot-tools), it give me License issue.