To cite package ‘pkgconfig’ in publications use:

  Csárdi G (2024). _pkgconfig: Private Configuration for 'R' Packages_.
  R package version 2.0.3, <https://github.com/r-lib/pkgconfig>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {pkgconfig: Private Configuration for 'R' Packages},
    author = {Gábor Csárdi},
    year = {2024},
    note = {R package version 2.0.3},
    url = {https://github.com/r-lib/pkgconfig},
  }