I am creating a new package that I would like to submit to Bioconductor. It's essentially a C code, which is called by R (using Rcpp).
One of the C functions within my package, is the C code of the R optimize function (obtained from a C file of the folder: R-3.6.1\src\library\stats\src\optimize.c), but slightly modified.
At the top of the R-3.6.1\src\library\stats\src\optimize.c file it states that: "This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version."
I am just not entirely certain if my package is allowed to contain this slightly modified C code of the R function? And if yes, should I place the aforementioned phrase "This program is free software..." in comments above the specific function?
Thank you in advance, Elena