foo.c: In function 'search':
foo.c:51:2: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
  for(int i = 0; i < 60; i++)
  ^
foo.c:51:2: note: use option -std=c99, -std=gnu99, -std=c11 or -std=gnu11 to compile your code