err

generating build.ninja...ERROR at //build/lib/pkg_config.gni:9:11: Script returned non-zero exit code.
  flags = exec_script(script, [ invoker.lib ], "scope")
          ^----------
Current dir: /home/jbarratt/build/antares/out/linux/opt/
Command: python -- /home/jbarratt/build/antares/build/lib/scripts/pkg_config.py libmodplug
Returned 1.
stderr:

Package libmodplug was not found in the pkg-config search path.
Perhaps you should add the directory containing `libmodplug.pc'
to the PKG_CONFIG_PATH environment variable
No package 'libmodplug' found
Traceback (most recent call last):
  File "/home/jbarratt/build/antares/build/lib/scripts/pkg_config.py", line 29, in <module>
    main()
  File "/home/jbarratt/build/antares/build/lib/scripts/pkg_config.py", line 24, in main
    values = subprocess.check_output(["pkg-config", flag, "--", library])
  File "/home/jbarratt/.pyenv/versions/2.7.10/lib/python2.7/subprocess.py", line 573, in check_output
    raise CalledProcessError(retcode, cmd, output=output)
subprocess.CalledProcessError: Command '['pkg-config', '--libs-only-l', '--', 'libmodplug']' returned non-zero exit status 1

See //ext/libmodplug/BUILD.gn:71:3: whence it was called.
  pkg_config("libmodplug_public") {
  ^--------------------------------
See //BUILD.gn:266:5: which caused the file to be included.
    "//ext/libmodplug",
    ^-----------------
     failed