Link GaudiExamples to ROOTHist for ROOT::RHist (ROOT >= 6.20)

GaudiExamples/CMakeLists.txt

@@ -14,7 +14,12 @@ gaudi_depends_on_subdirs(GaudiKernel GaudiUtils GaudiAlg RootCnv)
 
 find_package(AIDA)
 find_package(HepPDT)
-find_package(ROOT COMPONENTS Tree RIO Hist Net REQUIRED)
+find_package(ROOT COMPONENTS Core REQUIRED)
+if(${ROOT_VERSION_MAJOR}.${ROOT_VERSION_MINOR} VERSION_LESS 6.20)
+  find_package(ROOT COMPONENTS Tree RIO Hist Net REQUIRED)
+else()
+  find_package(ROOT COMPONENTS Tree RIO Hist Net ROOTHist REQUIRED)
+endif()
 find_package(Boost COMPONENTS python${boost_python_version} REQUIRED)
 find_package(CLHEP)
 find_package(PythonLibs REQUIRED)