diff --git a/Library/Homebrew/brew.h.rb b/Library/Homebrew/brew.h.rb
index 0c90177602..b05ce2ed2f 100644
--- a/Library/Homebrew/brew.h.rb
+++ b/Library/Homebrew/brew.h.rb
@@ -544,7 +544,9 @@ end
 
 def llvm_build
   if MACOS_VERSION >= 10.6
-    `/Developer/usr/bin/llvm-gcc-4.2 -v 2>&1` =~ /LLVM build (\d{4,})/  
+    xcode_path = `/usr/bin/xcode-select -print-path`.chomp
+    return nil if xcode_path.empty?
+    `#{xcode_path}/usr/bin/llvm-gcc-4.2 -v 2>&1` =~ /LLVM build (\d{4,})/
     $1.to_i
   end
 end