Flutter: Flutter Doctor "Android SDK에 적절한 빌드 도구가 없습니다." 오해의 소지가 있다

내 Android SDK의 빌드 도구가 최신 상태였기 때문에 다음 출력은 오해의 소지가 있습니다. 방금 sdk의 SDK 플랫폼 부분을 설치하지 않았습니다.

$ flutter doctor
[✓] Flutter (on Linux, channel master)
    • Flutter at <redacted>
    • Framework revision 2ac7d67e6a (85 minutes ago), 2016-10-25 10:40:54
    • Engine revision a8604ba9d2
    • Tools Dart version 1.21.0-dev.0.0

[-] Android toolchain - develop for Android devices
    • Android SDK at <redacted>
    x Android SDK does not have the proper build-tools.
    • Try re-installing or updating your Android SDK.

[✓] Atom - a lightweight development environment for Flutter
    • flutter plugin version 0.2.6
    • dartlang plugin version 0.6.42

Device <redacted> is not authorized.
You might need to check your device for an authorization dialog.
[✓] Connected devices
    • None