to build use latest android studio
http://developer.android.com/sdk/installing/studio.html
all needed libs are included
for ndk build set in your local.properties ndk.dir=C:\Android\android-ndk-r10b yes you need \ that for a folderpath
freedcam supports now 3 different apis:
android.hardware.camera
http://developer.android.com/reference/android/hardware/Camera.html
android.hardware.camera2
http://developer.android.com/reference/android/hardware/camera2/package-summary.html
sony camera remote api (PlayMemories)
https://developer.sony.com/downloads/camera-file/sony-camera-remote-api-beta-sdk/