dev-java/gradle-4.9: Plugin [id: 'org.gradle.kotlin.kotlin-dsl', version: '0.18.1'] was not found

[l29ah]

>>> Compiling source in /var/tmp/portage/dev-java/gradle-4.9/work/gradle-4.9 ...
Downloading file:/var/tmp/portage/dev-java/gradle-4.9/distdir/gradle-4.9-rc-2-bin.zip
........................................................................

Welcome to Gradle 4.9-rc-2!

Here are the highlights of this release:
 - Experimental APIs for creating and configuring tasks lazily
 - Pass arguments to JavaExec via CLI
 - Auxiliary publication dependency support for multi-project builds
 - Improved dependency insight report

For more details see https://docs.gradle.org/4.9-rc-2/release-notes.html

Starting a Gradle Daemon (subsequent builds will be faster)
Generating JAR file 'gradle-api-4.9-rc-2.jar'
Generating JAR file 'gradle-kotlin-dsl-extensions-0.18.4-4.9-rc-2.jar'
<-------------> 0% INITIALIZING [20s]
Parallel execution is an incubating feature.

FAILURE: Build failed with an exception.
sl.gradle.plugin-0.18.1.pomrors.gradle.kts' into local compilation cache
* Where:
Build file '/var/tmp/portage/dev-java/gradle-4.9/work/gradle-4.9/buildSrc/build.gradle.kts' line: 31

* What went wrong:
Plugin [id: 'org.gradle.kotlin.kotlin-dsl', version: '0.18.1'] was not found in any of the following sources:

- Gradle Core Plugins (plugin is not in 'org.gradle' namespace)
- Plugin Repositories (could not resolve plugin artifact 'org.gradle.kotlin.kotlin-dsl:org.gradle.kotlin.kotlin-dsl.gradle.plugin:0.18.1')
  Searched in the following repositories:
    Gradle Central Plugin Repository

* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.

* Get more help at https://help.gradle.org

BUILD FAILED in 52s
 * ERROR: dev-java/gradle-4.9::junkdrawer failed (compile phase):
 *   Gradle build failed