For me the requirement is: plain C interface, usable under MIT/BSD or less-restrictive license Something gets bonus points for not needing other libraries or s

For me the requirement is: plain C interface, usable under MIT/BSD or less-restrictive license Something gets bonus points for not needing other libraries or static data, so I could put it in a kernel, but usually I don't really need this. For example, Judy is LGPL. Darn. That alone is trouble, but Judy makes it more questionable due to non-trivial code in *.h files. Any good options?