diff --git a/Source/cmStandardIncludes.h b/Source/cmStandardIncludes.h
index 662a83119..38a7afac0 100644
--- a/Source/cmStandardIncludes.h
+++ b/Source/cmStandardIncludes.h
@@ -263,4 +263,22 @@ struct cmDocumentationEntry
   const char* full;
 };
 
+/** Data structure to represent a single command line.  */
+class cmCustomCommandLine: public std::vector<std::string>
+{
+public:
+  typedef std::vector<std::string> Superclass;
+  typedef Superclass::iterator iterator;
+  typedef Superclass::const_iterator const_iterator;
+};
+
+/** Data structure to represent a list of command lines.  */
+class cmCustomCommandLines: public std::vector<cmCustomCommandLine>
+{
+public:
+  typedef std::vector<cmCustomCommandLine> Superclass;
+  typedef Superclass::iterator iterator;
+  typedef Superclass::const_iterator const_iterator;
+};
+
 #endif