/usr/lib/R/site-library/Rglpk/INDEX is in r-cran-rglpk 0.3-5-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | Rglpk_read_file Interface to GLPK's file reader
Rglpk_solve_LP Linear and Mixed Integer Programming Solver
Using GLPK
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