> base.c:38:19: error: dereferencing ‘void *’ pointer [-Werror]
>
     if(a.ra < (*p)->info.ra)
>                    ^
> base.c:38:19: error: request for member ‘info’ in something not a structure or union
>
> base.c:39:16: error: dereferencing ‘void *’ pointer [-Werror]
>
       *p = (*p)->esq;
>
>                 ^

Boolean InsertBase(Base *p, Student a) {
  while((*p) != NULL){
    if(a.ra < (*p)->info.ra)
      *p = (*p)->left;
    else if(a.ra > (*p)->info.ra)
      *p = (*p)->right;
    else
      return false;
  }

  *p = MALLOC(sizeof(NoArv));
  (*p)->info = MALLOC(sizeof(Student));
  (*p)->info.ra = a.ra;
  (*p)->info.name = a.name;

  (*p)->left = (*p)->right = NULL;

  return true;

}

typedef void * Base;
typedef char * String;
typedef enum {false, true} Boolean;

typedef struct {
  int ra;
  String name;
  } Student;

typedef struct AuxNoArv {
  Student info;
  struct AuxNoArv *left,*right;
  } NoArv, * ImplBase;