message: Update mesh/CMakeLists.txt
diff: @@ -13,6 +13,7 @@ set(SRCS
  element.cpp
  hexahedron.cpp
  mesh.cpp
  + mesh_ext.cpp
  mesh_operators.cpp
  mesh_readers.cpp
  ncmesh.cpp
  @@ -30,6 +31,7 @@ set(HDRS
  element.hpp
  hexahedron.hpp
  mesh.hpp
  + mesh_ext.hpp
  mesh_headers.hpp
  mesh_operators.hpp
  ncmesh.hpp
  