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Something else to keep in mind is that the Ctypes library is really nice for consuming C libraries, so you may not be limited to just what's available on opam. It has a pretty intuitive way of bridging the gap manually, plus some automated codegen features for making the bindings for you (though I haven't used that part yet, no idea how difficult it is). Not as nice or convenient as opam install foo and being done with it, but better than doing without.
Same can be said of containers, which extends the stdlib rather than replaces or changes it. It's not fragmentation, it's a "batteries included" utility library that works with the stdlib.