<dependency>
  <groupId>org.codehaus.gant</groupId>
  <artifactId>gant_groovy2.1</artifactId>
  <version>1.9.9</version>
</dependency>

implementation 'org.codehaus.gant:gant_groovy2.1:1.9.9'

implementation("org.codehaus.gant:gant_groovy2.1:1.9.9")

libraryDependencies += "org.codehaus.gant" % "gant_groovy2.1" % "1.9.9"

@Grapes(
  @Grab(group='org.codehaus.gant', module='gant_groovy2.1', version='1.9.9')
)

<dependency org="org.codehaus.gant" name="gant_groovy2.1" rev="1.9.9" />

[org.codehaus.gant/gant_groovy2.1 "1.9.9"]

'org.codehaus.gant:gant_groovy2.1:jar:1.9.9'