problem with bool function in C

Hello.
I'm trying to build a program that will identify (from a text file given to it)
a palindrome.
Now i know that my program does not work and i need to work things around a bit but i keep receiving this strange error about bool function:

Code:

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error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘isPalindrome’

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my program is this (it uses the reverse fnction that i have built to reverse the string and if there is white spaces in that string - it will ignore them to form one big string that i can work with later.)

Code:

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#include <stdio.h>
#include <string.h>
#include <math.h>

bool isPalindrome(char fname[50]);
char *str_dopel(char *str1);

char *str_dopel(char *str1)
{
  register int i;
  char *str2;
  str2 = malloc(sizeof(str1));
  int ascii_value;
  int length = strlen(str1);
  for (i = strlen(str1)-1; i > -1; i--) {

        ascii_value = (int)str1[i];
        if (ascii_value == 32) {

        }else
        {
          str2[length - i] = str1[i-1];
          }

          }


  return (str2);

  }


bool isPalindrome(char fname[50])
{
 FILE *file;

 file = fopen(fname, "r");
 if (file == NULL) {
 printf("Error: Cannot open file.\n");
 return false;
 }
 else {
 printf("File Opened, checking for palindrome...");
}
char line[BUFSIZ];
char data[20][32];
while (fgets(line, sizeof line, file) != NULL)
{
  if (str_dopel(line) == line)
      printf("%s\n", line);
      return true;
  } else
  {
    printf("not palindrome\n");
return false;
    }

}
int main(void)
{
  char name[50];
  printf("Please enter the path to the file to be checked for palindromes: ");
  scanf("[^\n]", name);
  isPalindrome(name);

  return 0;
  }

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Looks like you're compiling using the c compiler and your compiler doesn't support c99 ( bool is not supported earlier ). if so, use int instead.
if your c compiler does supports c99 you should

Code:

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#include <stdbool.h>

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You could also use the c++ compiler to compile your code.

btw you have to

Code:

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#include <stdlib.h>

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as well ( for malloc ).
Kurt