[CI] Switching to AndroidPlayer is disabled

Hello,

I have a problem setting up environment for Unity Android build on CI machine (OS X). I want to configure and run builds via command line.

I've gone through machine configure with Android SDK installation and Unity & Android platform plugin installation from the command line.
When I try to build Android build in batch mode from the command line I keep on getting Android target error:
> Building a player for 'Android' (13) target is not supported in this Unity build.

Seems like Unity Android platform plugin doesn't get registered, though package installation is successful as I can see from logs.
I saw a thread with the same problem and a suggestion to export paths, but it doesn't help either.
Could you please help me to figure out, what I am missing? Is there generally a way to register and build Android target without a GUI tuning?

Technical details:

1. Environment setup:

Env is set up with following commands. All phases pass with positive results, Unity installation logs are attached to the letter.

brew install android-sdk
echo y | android update sdk --no-ui --all --filter "android-25,build-tools-25.0.2platform-tools,extra-android-m2repository,extra-google-m2repository"

curl -o Unity.pkg http://netstorage.unity3d.com/unity/38b4efef76f0/MacEditorInstaller/Unity-5.5.0f3.pkg
curl -o Unity-Android.pkg http://netstorage.unity3d.com/unity...ySetup-Android-Support-for-Editor-5.5.0f3.pkg

sudo installer -dumplog -package Unity.pkg -target /
sudo installer -dumplog -package Unity-Android.pkg -target /

2. Build script

Build script looks like:

Unity -projectPath PROJ_PATH -batchmode -nographics -serial XXXX -username XXXX -password XXXX -logFile /dev/stdout -executeMethod AndroidGradleBuilder.Build -quit

AndroidGradleBuilder.cs switches to BuildTarget.Android and manages build through AndroidBuildSystem.Gradle

Unity runs build but fails on the plugin step:

> Refreshing native plugins compatible for Editor in 0.02 ms, found 0 plugins.
...
> Switching to AndroidPlayer is disabled
(Filename: Line: -1)
*** Cancelled 'Build.SwitchBuildTargetEmulation.AndroidPlayer' in 0 seconds (0 ms)

Full logs attached