message: Fix the library check in the makefile.
diff: @@ -187,8 +187,8 @@ MFEM_REQ_LIB_DEPS = METIS SIDRE LAPACK SUNDIALS MESQUITE SUITESPARSE SUPERLU\
  PETSC_ERROR_MSG = $(if $(PETSC_FOUND),,. PETSC config not found: $(PETSC_VARS))
  define mfem_check_dependency
  -ifeq ($(MFEM_USE_$(1)),YES)
  - $(if $($(1)_LIB),,$(error $(1)_LIB is empty$($(1)_ERROR_MSG)))
  +ifeq ($$(MFEM_USE_$(1)),YES)
  + $$(if $$($(1)_LIB),,$$(error $(1)_LIB is empty$$($(1)_ERROR_MSG)))
  endif
  endef
  