wget -c http://ftp.openbsd.org/pub/OpenBSD/LibreSSL/libressl-2.7.3.tar.gz
tar -xzf libressl-2.7.3.tar.gz
cd libressl-2.7.3
mkdir -p build
cd build
../configure --prefix="/usr" --sysconfdir="/etc"
make # Doesn't mind -j#
make install