message: Guarded inclusion of sundials and petsc example directories in cmake build system.
  These should only be included when MFEM_USE_SUNDIALS and MFEM_USE_PETSC are set, respectively.
diff: @@ -81,6 +81,11 @@ foreach(SRC_FILE ${ALL_EXE_SRCS})
  endforeach()
  # Include the examples/sundials directory.
  +if(MFEM_USE_SUNDIALS)
  add_subdirectory(sundials)
  +endif()
  +
  # Include the examples/petsc directory.
  +if(MFEM_USE_PETSC)
  add_subdirectory(petsc)
  +endif()
  