diff -Naur a/cmake/Modules/Geant4MakeRules_cxx.cmake b/cmake/Modules/Geant4MakeRules_cxx.cmake
--- a/cmake/Modules/Geant4MakeRules_cxx.cmake	2016-06-10 12:04:27
+++ b/cmake/Modules/Geant4MakeRules_cxx.cmake	2023-12-04 16:49:28
@@ -51,7 +51,7 @@
   elseif(_gnucxx_version VERSION_LESS 4.7)
     set(_CXXSTDS "c++98" "c++0x")
   else()
-    set(_CXXSTDS "c++98" "c++0x" "c++11")
+    set(_CXXSTDS "c++98" "c++0x" "c++11" "c++14")
   endif()

   set(CXXSTD_IS_AVAILABLE ${_CXXSTDS} PARENT_SCOPE)
diff -Naur a/source/visualization/HepRep/sources.cmake b/source/visualization/HepRep/sources.cmake
--- a/source/visualization/HepRep/sources.cmake	2016-06-10 12:04:27
+++ b/source/visualization/HepRep/sources.cmake	2023-12-04 16:12:32
@@ -71,13 +71,13 @@
     G4HepRepMessenger.cc
     G4HepRepSceneHandler.cc
     G4HepRepViewer.cc
-    GZIPOutputStream.cc
+    gzipoutputstream.cc
     GZIPOutputStreamBuffer.cc
     IndentPrintWriter.cc
     XMLHepRepFactory.cc
     XMLHepRepWriter.cc
     XMLWriter.cc
-    ZipOutputStream.cc
+    zipoutputstream.cc
     ZipOutputStreamBuffer.cc
   GRANULAR_DEPENDENCIES
     G4csg