readline/readline.h: No such file or directory

Let’s take a simple readline program
#include
#include
#include

int main() {
char *s;
s= readline(NULL);
printf(“characters read: %s\n”, s);
}

On compiling this program
$ gcc readInput.c
readline.c:2: fatal error: readline/readline.h: No such file or directory
compilation terminated.

If you come across this error, you must install readline dev package
$ sudo apt-get install libreadline6 libreadline6-dev