having issue with PKG_CONFIG_PATH

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Hi team,
This chandra tried running end-to end co simulation with lowrisc_ibex core and i am facing an issue as mentioned below,kindly help me out ,even i tried same with pre-compiled built having same issue.

make --keep-going IBEX_CONFIG=opentitan SIMULATOR=questa ISS=spike ITERATIONS=1 SEED=1 TEST=$TEST_NAME WAVES=0 COV=0
Build metadata already exists, not recreating from scratch.
Building RTL testbench
Traceback (most recent call last):
File "/home/gonu.sekhar/Desktop/ibex/dv/uvm/core_ibex/scripts/compile_tb.py", line 94, in _main
subprocess.check_output(['pkg-config', '--exists'] + spike_iss_pc)
File "/usr/lib64/python3.9/subprocess.py", line 424, in check_output
return run(*popenargs, stdout=PIPE, timeout=timeout, check=True,
File "/usr/lib64/python3.9/subprocess.py", line 528, in run
raise CalledProcessError(retcode, process.args,
subprocess.CalledProcessError: Command '['pkg-config', '--exists', 'riscv-riscv', 'riscv-disasm', 'riscv-fdt', 'riscv-fesvr']' returned non-zero exit status 1.

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
File "/home/gonu.sekhar/Desktop/ibex/dv/uvm/core_ibex/scripts/compile_tb.py", line 149, in
sys.exit(_main())
File "/home/gonu.sekhar/Desktop/ibex/dv/uvm/core_ibex/scripts/compile_tb.py", line 96, in _main
raise RuntimeError(
RuntimeError: Failed to find ['riscv-riscv', 'riscv-disasm', 'riscv-fdt', 'riscv-fesvr'] pkg-config packages. Did you set the PKG_CONFIG_PATH correctly?
make[1]: *** [scripts/ibex_sim.mk:42: out/metadata/tb.compile.stamp] Error 1
Building randomized test generator
make[1]: *** [scripts/riscvdv.mk:61: out/metadata/instr.gen.build.stamp] Error 1
make[1]: Target 'all' not remade because of errors.
make: *** [Makefile:72: run] Error 2

## My Environment
i have followed all the steps which are mentioned in the git repo to install spike and gnu-toolchain

Start with dv/uvm/core_ibex/scripts/compile_tb.py at the pkg-config check, then rerun the reported make command to inspect whether the Spike packages are discoverable. Done means the required riscv-riscv, riscv-disasm, riscv-fdt, and riscv-fesvr packages are found and the testbench build proceeds.

Written by the indexing model from the issue text.