This is an HTTP/2 library. It doesn't include the tools because they need the array container from C++11 and I don't want to make it depend on a C++11 compiler (or on the additional libraries which they also pull in). Perhaps a separate port for the tools could be built later if people find they need them.
Currently, curl picks up nghttp2 if present at build time. Should we make curl depend on it, or disable it? I'd prefer it to depend on it. curl built with this does work: $ curl -I --http2 https://dmtx.uk/ HTTP/2.0 200 server:nginx date:Wed, 28 Oct 2015 12:02:32 GMT content-type:text/html content-length:1578 last-modified:Tue, 28 Apr 2015 20:42:06 GMT etag:"553ff09e-62a" accept-ranges:bytes
nghttp2.tgz
Description: application/tar-gz