R_ShowMessage   Show an R dialog message through R's C API.
callbacks       Create callbacks and call them through dyncall.
factorial       Recursive factorial using a callback object.
qsort           Sort an R numeric vector through C qsort and a callback comparator.
sqrt            Bind the C math library sqrt function.
stdio           Read and write R raw vectors through C stdio.
glpk            Solve a small linear program through the GLPK C API.
SDL             SDL3 Snake game demo.
SDL_tinycc      SDL3 Snake game demo with Rtinycc-compiled state and drawing.
SDL_audio       SDL3 planar audio demo.
SDL_raster      SDL3/OpenGL Mandelbrot raster demo with illustrative base R timing.
libxml2         Parse XML using direct libxml2 calls.
raylib          raylib recursive tree demo using aggregate arguments.
raylib_tinycc   raylib recursive tree demo with Rtinycc-compiled tree drawing.
