Installing ucspi-ssl with TLS 1.3 support ----------------------------------------- ucspi-ssl-0.10 can use TLS 1.3 capabilities alongside with your system's previous *SSL installation: a) OpenSSL 1.1.1: - Download OpenSSL and untar OpenSSL at some path; ie. /usr/local. - Execute./conf && make. Don't do 'make install'!! - conf-ssl: Include path to the header files via -I . (-I/usr/local/openssl-1.1.1/include) - conf-ssllib: Include path to the libraries via -L . (-L/usr/local/openssl-1.1.1 -lssl -lcrypto) b) LibreSSL 2.9.x: Download LibreSSL and untar LibreSSL at some path; ie. /usr/local. Execute./conf && make. Don't do 'make install'!! Do a ln -s ssl/.libs/libssl.so . ln -s crypto/.libs/libcrypto.so . in the LibreSSL main directory. - conf-ssl: Include path to the header files via -I . (-I/usr/local/libressl-2.9.1/include) - conf-ssllib: Include path to the libraries via -L . (-L/usr/local/libressl-2.9.1 -lssl -lcrypto) Recompile ucspi-ssl. This should be it. E. Hoffmann, September 2019.