GNU readline History feature

I'm using this code for the history features in my shell: http://cc.byexamples.com/20080613/gnu-readline-how-to-keep-a-history-list-of-entered-command-lines/ but when I compile this using gcc, I got this error $ gcc filename.c /tmp/ccay2CgM.o: In function `main': rl.c:(.text+0x9): undefined reference to `rl_abort' rl.c:(.text+0x13): undefined reference to `rl_bind_key' rl.c:(.text+0x1d): undefined reference to `readline' rl.c:(.text+0x61): undefined reference to `add_history' collect2: ld returned 1 exit status $
can you add the exact command you're using to compile it?

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