anchor.diff:  
     configureFlags = optionals (versionAtLeast source.version "7.0.0") [
       "--ninja"
  +  ] ++ optionals (!(versionAtLeast source.version "11.0.0")) [
  +    "--shared-http-parser"
     ] ++ [
  -    "--shared-http-parser"
       "--shared-libuv"
     ] ++ optionals (versionAtLeast source.version "8.0.0") [
       "--shared-nghttp2"
  
positive.code: 
    buildInputs = [
      c-ares
      http-parser
      icu
      libuv
    ] ++ optionals (versionAtLeast source.version "8.0.0") [
  
negative.code: 
  , channel
  }:
  
  # FIXME: Need to add llhttp dependency, currently using the vendored
  #        http_parser/llhttp sources for >=11.
  
  let
    inherit (lib)
  