Configuration depends on task

build.gradle

configurations {
	myConfig
}
task addToMyConfig {
	doLast {
		println "Doing some work"
		dependencies {
			myConfig 'log4j:log4j:1.2.17'
		}
	}
}
task useMyConfig {
	doLast {
		println "myConfig = $configurations.myConfig.files"
	}
}