3 files changed, 12 insertions, 4 deletions
diff --git a/Library/Homebrew/download_strategy.rb b/Library/Homebrew/download_strategy.rb
index f814f5d5b..008fcc1bc 100644
--- a/Library/Homebrew/download_strategy.rb
+++ b/Library/Homebrew/download_strategy.rb
@@ -88,12 +88,12 @@ class CurlDownloadStrategy < AbstractDownloadStrategy
 
     case @tarball_path.compression_type
     when :zip
-      quiet_safe_system '/usr/bin/unzip', {:quiet_flag => '-qq'}, @tarball_path
+      with_system_path { quiet_safe_system 'unzip', {:quiet_flag => '-qq'}, @tarball_path }
       chdir
     when :gzip, :bzip2, :compress, :tar
       # Assume these are also tarred
       # TODO check if it's really a tar archive
-      safe_system '/usr/bin/tar', 'xf', @tarball_path
+      with_system_path { safe_system 'tar', 'xf', @tarball_path }
       chdir
     when :xz
       raise "You must install XZutils: brew install xz" unless which "xz"
@@ -178,7 +178,7 @@ end
 class GzipOnlyDownloadStrategy < CurlDownloadStrategy
   def stage
     FileUtils.mv @tarball_path, File.basename(@url)
-    safe_system '/usr/bin/gunzip', '-f', File.basename(@url)
+    with_system_path { safe_system 'gunzip', '-f', File.basename(@url) }
   end
 end
 
diff --git a/Library/Homebrew/extend/fileutils.rb b/Library/Homebrew/extend/fileutils.rb
index 231d3b769..30ab584c3 100644
--- a/Library/Homebrew/extend/fileutils.rb
+++ b/Library/Homebrew/extend/fileutils.rb
@@ -14,7 +14,7 @@ module FileUtils extend self
     # /tmp volume to the other volume. So we let the user override the tmp
     # prefix if they need to.
     tmp = ENV['HOMEBREW_TEMP'].chuzzle || '/tmp'
-    tempd = `/usr/bin/mktemp -d #{tmp}/#{name}-XXXX`.chuzzle
+    tempd = with_system_path { `mktemp -d #{tmp}/#{name}-XXXX` }.chuzzle
     raise "Failed to create sandbox" if tempd.nil?
     prevd = pwd
     cd tempd
diff --git a/Library/Homebrew/utils.rb b/Library/Homebrew/utils.rb
index 955c1e8f2..a6b093acc 100644
--- a/Library/Homebrew/utils.rb
+++ b/Library/Homebrew/utils.rb
@@ -99,6 +99,14 @@ module Homebrew
   end
 end
 
+def with_system_path
+  old_path = ENV['PATH']
+  ENV['PATH'] = '/usr/bin:/bin'
+  yield
+ensure
+  ENV['PATH'] = old_path
+end
+
 # Kernel.system but with exceptions
 def safe_system cmd, *args
   unless Homebrew.system cmd, *args