On this page: http://www.gradle.org/docs/current/userguide/installation.html, you say: “You need a GNU compatible tool to unzip Gradle, if you want the file permissions to be properly set. We mention this as some zip front ends for Mac OS X don’t restore the file permissions properly.”
This makes no sense. There is nothing “GNU” about zip or any zip utilities. You are perhaps confused by gzip, which is a Unix utility that is in the GNU family, but has nothing to do with the gzip format. gzip processes .gz files, not .zip files. If you want people to use the Info-ZIP unzip to extract your files, then you should say that. Info-ZIP has nothing to do with GNU. Note: I am a co-author of the Info-ZIP tools, as well as gzip.