message: Fix `make install`
diff: @@ -597,8 +597,14 @@ install: $(if $(static),$(BLD)libmfem.a) $(if $(shared),$(BLD)libmfem.$(SO_EXT))
  $(INSTALL) -m 640 $(SRC)$$dir/*.okl $(PREFIX_INC)/mfem/$$dir; \
  done
  # install libCEED q-function headers
  - mkdir -p $(PREFIX_INC)/mfem/fem/ceed
  - $(INSTALL) -m 640 $(SRC)fem/ceed/*.h $(PREFIX_INC)/mfem/fem/ceed
  + mkdir -p $(PREFIX_INC)/mfem/fem/ceed/integrators/mass
  + $(INSTALL) -m 640 $(SRC)fem/ceed/integrators/mass/*.h $(PREFIX_INC)/mfem/fem/ceed/integrators/mass
  + mkdir -p $(PREFIX_INC)/mfem/fem/ceed/integrators/convection
  + $(INSTALL) -m 640 $(SRC)fem/ceed/integrators/convection/*.h $(PREFIX_INC)/mfem/fem/ceed/integrators/convection
  + mkdir -p $(PREFIX_INC)/mfem/fem/ceed/integrators/diffusion
  + $(INSTALL) -m 640 $(SRC)fem/ceed/integrators/diffusion/*.h $(PREFIX_INC)/mfem/fem/ceed/integrators/diffusion
  + mkdir -p $(PREFIX_INC)/mfem/fem/ceed/integrators/nlconvection
  + $(INSTALL) -m 640 $(SRC)fem/ceed/integrators/nlconvection/*.h $(PREFIX_INC)/mfem/fem/ceed/integrators/nlconvection
  # install config.mk in $(PREFIX_SHARE)
  mkdir -p $(PREFIX_SHARE)
  $(MAKE) -C $(BLD)config config-mk CONFIG_MK=config-install.mk
  