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...ed C code that I call from R, and I would like to distribute this code as an R package through CRAN. In the C code, I use the gsl numerical libraries, mainly for the BLAS interface, some linear algebra functions, and some optimization routines. As I prepare this code to conform to the specs for R packagtes, I am wondering if there is a restriction on the use of external libraries in R packages, or am I limited to those functions in the R API (or, in other words, do I need to convert my gsl function calls to R API function calls)? I have sifted through the R documentation on this matter, but I coul...