undefined reference to function declared in *.h file

Question

I am a unskilled programmer and new to linux, I run into a problem when complining. I have two files \'ex_addinst.c\' and \'lindo.h\' in the same folder, I input command :

Answer 1

You need to tell gcc to link with the library or object file(s) that contain the LS... functions you're using. The header file tells the compiler how to call them, but the linker needs to know where to get the compiled code from.