ENH: Added support for CABLE_SOURCE_FILES to refer to files that are not in the current directory. The include path is searched for the files.

Source/cmCableSourceFilesCommand.h

@@ -68,7 +68,8 @@ public:
     }
 
   virtual void WriteConfiguration() const;
-
+  bool SourceFileExists(const std::string&) const;
+  
   cmTypeMacro(cmCableSourceFilesCommand, cmCableCommand);
 protected:
   typedef cmCablePackageEntryCommand::Entries  Entries;