two or more data types in declaration specifiers

main.c:13: error: two or more data types in declaration specifiers
make[1]: *** [main.o] Error 1
make: *** [build] Error 2

struct savetype{
    bool file_exists;
}

#include "main.h"
extern struct savetype save;
int main (void){
return 0;
}

#include "main.h"
struct savetype save;
save.file_exists=true;

struct savetype{
    bool file_exists;
};
^^^^ <-------------- Here!

#define TRUE 1
#define FALSE 0

if (var == TRUE){

}

typedef int bool;

#include <stdbool.h>