They should be compiled separately, through scripts
such as the one available in
"hdl/testbench/wishbone/wb_acq_core_test/verilog/
artix7/full_tb_mux/questa_compile.sh".

This is only necessary as some of these libraries contains
encrypted files and can't be compiled externally (e.g., modelsim),
giving us a warning: "memory in protected region".