Answers for "build flutter for macos"

flutter setup macos

if your terminal doesn't see "flutter" you have to use  
Open terminal and paste 

export PATH="$PATH:`pwd`/flutter/bin"
and then try "flutter" && "flutter doctor"

build flutter for macos

export ENABLE_FLUTTER_DESKTOP=true

build flutter for macos

flutter channel masterflutter upgrade

run flutter app macos

open terminal  tap "cd" Drag/drop with mouse the Folder of your App and tap enter
Tap "flutter run" tap enter