<dependency>
  <groupId>org.jruby.extras</groupId>
  <artifactId>jffi</artifactId>
  <version>0.5</version>
</dependency>

implementation 'org.jruby.extras:jffi:0.5'

implementation("org.jruby.extras:jffi:0.5")

libraryDependencies += "org.jruby.extras" % "jffi" % "0.5"

@Grapes(
  @Grab(group='org.jruby.extras', module='jffi', version='0.5')
)

<dependency org="org.jruby.extras" name="jffi" rev="0.5" />

[org.jruby.extras/jffi "0.5"]

'org.jruby.extras:jffi:jar:0.5'