> +         (add-before 'configure 'chdir
> +           (lambda _
> +             (chdir "subprojects/groovy-ant")))

#t

> +         (add-before 'build 'copy-resources
> +           (lambda _
> +             (copy-recursively "src/main/resources" "build/classes")))

#t

>(input
> +     `(("groovy-groovydoc" ,groovy-groovydoc)

Hmm, regular input?  Not either native or propagated?  How does it work?