gluon - javafxports 'android' gradle task requires "Android Support Library" which is retired from Android SDK Manager...what now?

So far (current release version 1.2.0), the jfxmobile plugin has been working with the obsolete Android Support Library.

As now it is not only obsolete but not available any more for download, as Joeri Sykora commented, there is a snapshot available with a fix to use the new Support Repository.

Until release version 1.3.0 is out, you can use it providing you refer the repository to download this snapshot, so there is no need to download, build or install manually the plugin:

buildscript {
    repositories {
        maven {
            url 'https://oss.sonatype.org/content/repositories/snapshots'
        }
        jcenter()
    }
    dependencies {
        classpath 'org.javafxports:jfxmobile-plugin:1.3.0-SNAPSHOT'
    }
}

This will work if you have installed with the Android SDK Manager Extras/Google Repository: check your Android sdk path for this folder: ANDROID_HOME/extras/google/m2repository, and the Extras/Android Support Repository: check for ANDROID_HOME/extras/android/m2repository/com/android/support/multidex/1.0.1/multidex-1.0.1.aar

And don't forget to apply the changes in the build script to your gradle project (Sync button on top-left of Gradle window in IntelliJ).