Hi! I am having some problem to get a program written i GCC to communicate with the serialport on my Ubuntu computer. The basic problem is the step of adding a library. I am trying to get this example to work. http://www.captain.at/howto-simple-serial-port-test-example.php This is kind of a newbie question, i know. There are three files to download, into files on the computer. One "ser.c" that is the actual program, one that is "capser.h" and one "capser.c" I have put capser.h into /usr/include and that seams to be right, but where do i put the capser.c file? im not really familjar with the "makefile" since i have mostly programed AVR-gcc wich has handeld that for me. When i put the Capser.h in /usr/include and run "gcc -o ser ser.c" i got the message "undefined reference to GetBaud", and four other similar messages. What do i need to to with the Capser.c file? Any help is highly appreciated! //Alexander -- View this message in context: http://old.nabble.com/Adding-library-to-GCC-tp26772264p26772264.html Sent from the gcc - Help mailing list archive at Nabble.com.