Package a library with the Mod .jar

Hello,

I am depending on a local .jar file in my mod, and the mod only works if this jar is also in the Mods folder.

What do I need to append to the build.gradle to remove the need of multiple downloads (for my users)?

I've tried

jar {

    from configurations.compile.collect { it.isDirectory() ? it : zipTree(it) }

}

but it lets the Build fail.