In `sic_repl.c'(13) there is a loop for reading strings typed by the user, evaluating them and printing the results. GNU readline is ideally suited to this, but it is not always available -- or sometimes people simply may not wish to use it.
With the help of GNU Autotools, it is very easy to cater for building with and without GNU readline. `sic_repl.c' uses this function to read lines of input from the user:
To make this work, I must write an Autoconf macro which adds an option to `configure', so that when the package is installed, it will use the readline library if `--with-readline' is used:
Having put this macro in the file `config/readline.m4', I must also
call the new macro (