The following packages can be used to add features to mosquitto. All of them are optional. * openssl * c-ares (for DNS-SRV support, disabled by default) * tcp-wrappers (optional, package name libwrap0-dev) * libwebsockets (optional, disabled by default, version 1.3 and above) * On Windows, a pthreads library is required if threading support is to be included. To compile, run "make", but also see the file config.mk for more details on the various options that can be compiled in. Where possible use the Makefiles to compile. This is particularly relevant for the client libraries as symbol information will be included. Use cmake to compile on Windows or Mac. If you have any questions, problems or suggestions (particularly related to installing on a more unusual device like a plug-computer) then please get in touch using the details in readme.txt.