From 5d449cf34e659dfc21ef67fbc4a0dbc70718e904 Mon Sep 17 00:00:00 2001
From: Markus Reiter <me@reitermark.us>
Date: Tue, 28 Nov 2017 20:22:46 +0100
Subject: [PATCH] Fix external Cask commands.

---
 Library/Homebrew/cask/lib/hbc/cli.rb | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/Library/Homebrew/cask/lib/hbc/cli.rb b/Library/Homebrew/cask/lib/hbc/cli.rb
index 215b59843d..e2deb6f671 100644
--- a/Library/Homebrew/cask/lib/hbc/cli.rb
+++ b/Library/Homebrew/cask/lib/hbc/cli.rb
@@ -113,9 +113,9 @@ module Hbc
           # other Ruby libraries must do everything via "require"
           klass.run(*args)
         end
-      elsif which("brewcask-#{command}")
+      elsif external_command = which("brewcask-#{command}", ENV["HOMEBREW_PATH"])
         # arbitrary external executable on PATH, Homebrew-style
-        exec "brewcask-#{command}", *ARGV[1..-1]
+        exec external_command, *ARGV[1..-1]
       elsif Pathname.new(command.to_s).executable? &&
             command.to_s.include?("/") &&
             !command.to_s.match(/\.rb$/)