In reply to Divya_LTTS:
To give you a package file:
apb_pkg.sv looks like this
package apg_pkg;
// Imports
import uvm_pkg::*;
`include "uvm_macros.svh"
// UVC includes
`include "apb_seq_item.sv"
`include "apb_config.sv"
`include "apb_driver.sv"
`include "apb_monitor.sv"
`include "apb_sequencer.sv"
`include "apb_coverage.sv"
`include "apb_agent.sv"
`include "apb_env.sv"
`include "apb_seq_lib.sv"
endpackage
`include "apb_if.sv"
The Questa compilation command is
vlog apb_pkg.sv