エラーの意味が理解できません。

前提・実現したいこと

3つのソースコードを使ってプログラムを組んでいるのですが、エラーが出てき、そのエラーを解決する策がわかりません。
アドバイス等お願い致します。

発生している問題・エラーメッセージ

Undefined symbols for architecture x86_64:
  "_addList", referenced from:
      _main in kadai13-f84c84.o
  "_calcBMI", referenced from:
      _main in kadai13-f84c84.o
  "_listSize", referenced from:
      _main in kadai13-f84c84.o
  "_newList", referenced from:
      _main in kadai13-f84c84.o
  "_readPlayer", referenced from:
      _main in kadai13-f84c84.o
  "_top", referenced from:
      _main in kadai13-f84c84.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)

該当のソースコード

c
1#include <stdio.h>
2#include <stdlib.h> 
3#include "player.h"
4#include<errno.h>
5#include <string.h>
6
7Player player[100];		// 100人分の配列
8char fileIN[] = "z12-in.dat";   
9char fileOUT[]= "z12-out.dat";  
10
11// main 関数
12int main(int argc,char *argv[]) {		
13    char *filename;				
14    FILE *in,*out;				
15    float sumWeight = 0.0;		
16    int i;					
17    Player *p;					
18    List *lst;				
19
20    if(argc>1) {				
21	filename = argv[1];			
22	if((in = fopen(filename,"r")) == NULL) {
23	    fprintf(stderr,"開けません(%s).\n", filename); 
24	    fprintf(stderr,"errno:[%d], strerror: [%s]\n", errno,strerror(errno));
25	    
26	    exit(1);				
27	}
28    } else in = stdin; 				
29
30    if(argc>2) {				
31	filename = argv[2];			
32	if((out = fopen(filename,"w")) == NULL) {
33	    fprintf(stderr,"開けません(%s).\n", filename); 
34	    exit(1);			
35	}
36    } else out = stdout;			
37
38    while((p = readPlayer(in)) != NULL) { 	
39	sumWeight += p->weight;			
40	calcBMI(p); 				
41	if(top == NULL) top = newList(p);	
42	else if(top->player->VAR < p->VAR) {	
43	    List *nl = newList(p);		
44	    nl->next = top;			
45	    top = nl;				
46	} else addList(top,p);			
47    }
48    fclose(in);				
49					
50    fprintf(out,"苗字(家族名)         名前(個人名)         身長   体重   BMI\n");
51    for(lst = top;lst != NULL; lst=lst->next) { 
52	p = lst->player;			
53	fprintf(out,"%-20s %-20s %3.0fcm %3.0fkg %6.2f\n",		
54		p->familyName,p->personalName,p->height,p->weight,p->bmi);
55    }
56    // 統計データの出力(ここでは、平均体重)	
57    fprintf(out, "平均体重は %6.2fkg\n", sumWeight/listSize(top));
58    fclose(out);				
59    return 0;		
60}
61	
62

list.c
1#include <stdio.h>
2#include <stdlib.h>
3#include "player.h"
4
5List *top = NULL;	
6List *newList(Player *p) {
7    List *l = (List *)malloc(sizeof (List)); 
8    l->player = p;			
9    l->next   = NULL;			
10    return l;
11}
12
13
14void addList(List *l,Player *p) {
15    if(l->player->VAR < p->VAR) return ;
16    while(l->next) {			
17	if(l->next->player->VAR < p->VAR) { 
18	    List *n = newList(p);	
19	    n->next = l->next;		
20	    l->next = n;		
21	    return;			
22	}
23	l = l->next;			
24    }
25    l->next = newList(p);		
26}
27
28
29int listSize(List *t) {
30    int n = 0;			
31    while(t != NULL) {		
32	n++;			
33	t = t->next;		
34    }
35    return n;			
36}
37
38
39Player *newPlayer() {
40    Player *p = (Player *)calloc(sizeof(Player),1);
41    return p;					
42}
43
44
45Player *readPlayer(FILE *fh) {
46    Player *p = newPlayer(); 			
47    int n = fscanf(fh,"%s%s%f%f",&(p->familyName),&(p->personalName),
48	&(p->height),&(p->weight));
49    if(n == 4) return p;			
50    free(p);					
51    return NULL;				
52}
53
54
55void calcBMI(Player *p) {
56    p->bmi = p->weight / ((p->height/100)*(p->height/100));
57}

player.h
1#ifndef __PLAYER_H__	
2#define __PLAYER_H__
3#include <stdio.h>	
4
5#define VAR height	
6
7typedef struct {		
8    char familyName[20]; 	
9    char personalName[20];	
10    float height;	
11    float weight;		
12    float bmi;  		
13} Player;
14
15typedef struct LIST {		
16    Player *player;     
17    struct LIST *next; 		
18} List;
19
20
21extern List *top;	
22// 関数プロトタイプ宣言
23List *newList(Player *p);	
24void addList(List *l,Player *p); 
25int listSize(List *t);		
26 
27Player *newPlayer();		
28Player *readPlayer(FILE *fh);
29void calcBMI(Player *p);
30
31#endif