/usr/lib/R/site-library/pkgconfig/INDEX is in r-cran-pkgconfig 2.0.1-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 | get_config Query a configuration parameter key
pkgconfig-package Persistent configuration for R packages
set_config Set a configuration parameter
set_config_in Set a configuration parameter for a package
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