is there a #define (or any other method) to tell apart VC 2005 from VC 2005 express

Hi, is there a #define (or any other method) to tell apart VC 2005 from VC 2005 express?
 I have some code in a svn repository that does not compile when trying to compile it on VS express. Since this is just an optional part of the project i do not care if it does not get compiled although i'd like not to have to comment it out by hand every time i switch to VS express.
  
No.  You could set an environment variable and add $(YourEnvVarName) to the preprocessor definitions.
Moving thread to the VC++ forum.