==> Cloning https://github.com/WebKit/webkit.git
Cloning into '/Library/Caches/Homebrew/webkitgtk--git'...
fatal: Remote branch master not found in upstream origin
Error: webkitgtk: Failed to download resource "webkitgtk"
Failure while executing; git clone --branch master -c advice.detachedHead=false https://github.com/WebKit/webkit.git /Library/Caches/Homebrew/webkitgtk--git exited with 128. Here's the output:
Cloning into '/Users/Falcon/Library/Caches/Homebrew/webkitgtk--git'...
fatal: Remote branch master not found in upstream origin