diff -u -r1.6 -r1.7
--- LCFourVector.h	22 Mar 2006 11:53:22 -0000	1.6
+++ LCFourVector.h	24 Mar 2006 11:11:36 -0000	1.7
@@ -1,5 +1,5 @@

 // -*- C++ -*-

-#ifdef CLHEP  // only if CLHEP is available !

+#ifdef USE_CLHEP  // only if CLHEP is available !

 
 #ifndef UTIL_LCFourVector_H
 #define UTIL_LCFourVector_H 1

@@ -87,4 +87,4 @@

 
 
 #endif /* ifndef UTIL_LCFOURVECTOR_H */

-#endif

+#endif  // USE_CLHEP

diff -u -r1.6 -r1.7
--- LCFourVector.icc	29 Nov 2005 19:55:34 -0000	1.6
+++ LCFourVector.icc	24 Mar 2006 11:11:36 -0000	1.7
@@ -1,4 +1,4 @@

-#ifdef CLHEP  // only if CLHEP is available !

+#ifdef USE_CLHEP  // only if CLHEP is available !

 
 #include "UTIL/LCFourVector.h"
 #include "IMPL/MCParticleImpl.h"

@@ -70,4 +70,4 @@

   }
   
 } // end namespace

-#endif

+#endif  // USE_CLHEP