install: don't install alias if already installed

1 files changed, 8 insertions, 3 deletions

diff --git a/Library/Homebrew/cmd/install.rb b/Library/Homebrew/cmd/install.rb
index 99cb75353..fdaf68d53 100644
--- a/Library/Homebrew/cmd/install.rb
+++ b/Library/Homebrew/cmd/install.rb
@@ -133,9 +133,14 @@ module Homebrew
           raise "No devel block is defined for #{f.full_name}"
         end
 
-        if f.installed?
-          msg = "#{f.full_name}-#{f.installed_version} already installed"
-          msg << ", it's just not linked" unless f.linked_keg.symlink? || f.keg_only?
+        current = f if f.installed?
+        current ||= f.old_installed_formulae.first
+
+        if current
+          msg = "#{current.full_name}-#{current.installed_version} already installed"
+          unless current.linked_keg.symlink? || current.keg_only?
+            msg << ", it's just not linked"
+          end
           opoo msg
         elsif f.migration_needed? && !ARGV.force?
           # Check if the formula we try to install is the same as installed