According to this line in your output,
configure: error: no acceptable C compiler found in $PATH
you don't have a C compiler installed (which is needed by Device::SerialPort
). Some (but not all) modules require a C compiler.
Module names are case-sensitive. So, your attempts to install Net::SSH and Net::Telnet failed because cpan could not find the modules. Also, you should not need to use the -f flag in most cases. After you install a C compiler, you may want to try the following.
cpan -i Net::SSH
cpan -i Net::Telnet
If you want more specific advice on how to fix these problems, then please let us know which operating system you are running and which version of perl you are running.