+You can also choose a particular ABI by passing `ANDROID_ABI` variable to
+cmake, e.g., `-DANDROID_ABI=x86`.
+
+FirefoxOS
+---------
+
+Put Apitrace source tree into `B2GROOT/external/apitrace/` and the `Android.mk`
+file (`B2GROOT/external/apitrace/Android.mk`) will do the needful to compile
+and install apitrace appropriately into the system image as part of FirefoxOS
+build process. It expects a linaro-type of Android NDK to be present in
+`../../prebuilt/ndk/android-ndk-r7` (ie `B2GROOT/prebuilt/ndk/android-ndk-r7`).
+
+