Can't find Xcode.app but it is in the folder

[startergo]

Developer folder is linked to / by synthetic.conf Copied the 4.2 Developer from SL to the /Developer folder:

Applications % ls -la
total 168
drwxrwxr-x  12 mbp151  staff    384 May 22 18:48 .
drwxr-xr-x  16 mbp151  wheel    512 May 22 18:48 ..
-rw-r--r--@  1 mbp151  staff   6148 May 22 18:42 .DS_Store
drwxrwxr-x   5 mbp151  staff    160 May 15 15:09 Audio
drwxrwxr-x   3 mbp151  staff     96 May 22 12:51 Dashcode.app
drwxrwxr-x  10 mbp151  staff    320 May 22 12:50 Graphics Tools
drwxrwxr-x   3 mbp151  staff     96 May 22 12:51 Instruments.app
drwxrwxr-x   5 mbp151  staff    160 May 22 18:42 Performance Tools
drwxrwxr-x   3 mbp151  staff     96 May 22 12:51 Quartz Composer.app
drwxrwxr-x  20 mbp151  staff    640 May 22 18:42 Utilities
drwxrwxr-x   3 mbp151  staff     96 May 22 12:51 Xcode.app
-rwxr-xr-x@  1 mbp151  wheel  74340 May 22 13:24 XcodeLegacy.sh
mbp151@MBP151s-MacBook-Pro Applications % sudo ./XcodeLegacy.sh -osx106 install
*** Info: found Xcode >= 4.3 in /Applications/Xcode.app
*** Error: could not find Xcode 4.2 in /Developer/Applications nor Xcode >= 4.3 in /Applications, cannot install
mbp151@MBP151s-MacBook-Pro Applications % pwd
/Developer/Applications

       Location: /Users/Shared/Developer/Applications/Xcode.app
      Bundle ID: com.apple.dt.Xcode
Alternate Names: Xcode.app
           Size: 4.64MB
        Version: 4.2
       Released: 05/22/24
      Purchased: 
      Last Used: 
       Category: Developer Tools
      Copyright: Copyright © 1999–2011 Apple Inc. All rights reserved.
   Architecture: Intel, i386

Downloaded the 3.2.6 Xcode from Apple.:

sudo ./XcodeLegacy.sh -osx106 buildpackages
*** Info: found Xcode >= 4.3 in /Applications/Xcode.app
expected   CRC32 $60727D28
/dev/disk5          	Apple_partition_scheme         	
/dev/disk5s1        	Apple_partition_map            	
/dev/disk5s2        	Apple_Driver_ATAPI             	
/dev/disk5s3        	Apple_HFS                      	/Users/mbp151/Downloads/mount.GPf/Xcode and iOS SDK
cp: hashtable-gcc-4.0.4: No such file or directory
*** Created Xcode106SDK.tar.gz in directory /Users/mbp151/Downloads
"disk5" ejected.