When the build barfs on the Android gradle plugin's bug which makes it think that gradle 2.10+ is older than 2.2.
https://discuss.gradle.org/t/gradle-thinks-2-10-is-less-than-2-2-when-resolving-plugins/13434 https://android.googlesource.com/platform/tools/base/+/b96ce169b385d006cfccc4c9f1e54ab47140f59d https://gitlab.com/fdroid/fdroidserver/issues/184