Coding question: Confusion over a step-by-step tutorial

This tutorial was written for the DOS version of the code which differs in some aspect to the windows port version which you are using.
s_inkychase1 and co. you probably need to define like the rest - "extern statetype s_inkychase1;"

...SPR_BLINKY_W1,10,T_Chase,NULL...
should be also:
...SPR_BLINKY_W1,10,(statefunc)T_Chase,NULL...

You can check in already existing code (like for the officer) how it looks there.

In SpawnGhosts for example:
new->obclass = ghostobj;
should be changed to:
newobj->obclass = ghostobj;

also for the rest of the "new->".
Also you maybe forgot or mistyped ; at end of lines.

Awesome. This makes a ton of sense.. I noticed some things were slightly different. Thank you so much!

Here's how I got it to work.

1) In wl_act2.cpp, around line 450, inside the GUARD section, underneath the guard externs and statetypes:

//
// ghosts
//

extern  statetype s_blinkywait1;

extern  statetype s_blinkychase1;
extern  statetype s_blinkychase2;
extern  statetype s_blinkychase3;
extern  statetype s_blinkychase4;

extern  statetype s_blinkydie1;
extern  statetype s_blinkydie2;
extern  statetype s_blinkydie3;
extern  statetype s_blinkydie4;

statetype s_blinkywait1          = {false,SPR_BLINKY_W1,0,(statefunc)T_Stand,NULL,&s_blinkywait1};

statetype s_blinkychase1         = {false,SPR_BLINKY_W1,10,(statefunc)T_Ghosts,NULL,&s_blinkychase2};
statetype s_blinkychase2         = {false,SPR_BLINKY_W2,10,(statefunc)T_Ghosts,NULL,&s_blinkychase3};
statetype s_blinkychase3         = {false,SPR_PINKY_W1,10,(statefunc)T_Ghosts,NULL,&s_blinkychase4};
statetype s_blinkychase4         = {false,SPR_PINKY_W2,10,(statefunc)T_Ghosts,NULL,&s_blinkychase1};

statetype s_blinkydie1          = {false,SPR_INKY_W1,10,NULL,NULL,&s_blinkydie2};
statetype s_blinkydie2          = {false,SPR_INKY_W2,10,NULL,NULL,&s_blinkydie3};
statetype s_blinkydie3          = {false,SPR_CLYDE_W1,10,NULL,NULL,&s_blinkydie4};
statetype s_blinkydie4          = {false,SPR_CLYDE_W2,10,NULL,NULL,&s_blinkydie4};
#endif

2) In wl_Act2, Around line 2004, inside the SCHABBS / GIFT / FAT section. There's an #indef SPEAR at the beginning. Immediately following:

/*
===============
=
= SpawnGhosts
=
===============
*/

#indef SPEAR

void SpawnGhosts (int which, int tilex, int tiley)
{
     SpawnNewObj (tilex,tiley,&s_blinkywait1);
     newobj->obclass = ghostobj;
     newobj->speed = SPDDOG;
     newobj->dir = nodir;
     newobj->hitpoints = starthitpoints[gamestate.difficulty][en_blinky];
     newobj->flags |= FL_SHOOTABLE; //change to |= FL_SHOOTABLE|FL_AMBUSH; if you want ghost to initiate attack only on sight
     if (!loadedgame)
         gamestate.killtotal++;
}

3) In wl_def.h, around line 1253, insert this inside WL_ACT2 DEFINITIONS. I put it underneath s_grddie1:

extern  statetype s_blinkydie1;

3.b) Also, place this in a slightly lower section. I chose to put it above s_hitlerchase1:

extern  statetype s_blinkychase1;


4) In wl_state.cpp, insert this inside KILLACTOR Section. I put it directly underneath case_dogobj;

        case ghostobj:
            GivePoints (1000);
            NewState (ob,&s_blinkydie1);
            break;

5) In wl_state.cpp, insert this in First Sighting section. I put it directly underneath case_realhitlerobj;

        case ghostobj:
            PlaySoundLocActor(SCHABBSHASND,ob);
            NewState (ob,&s_blinkychase1);
            ob->speed *=2;          // go faster when chasing player
            break;

6) In wl_state.cpp, insert this in Sight Player section. I put it directly above case_bossobj;

            case ghostobj:

This should be it.

I'm getting an error message if I try to incorporate a death sound, so I can work out the kinks of that later. Note that this is my flavor for a pac-man ghost enemy. I like to have him wait until he hears me to attack. Pac-Man actually charges after you once the game begins. If you want to have this, for step 2, change

     SpawnNewObj (tilex,tiley,&s_blinkywait1);

into

     SpawnNewObj (tilex,tiley,&s_blinkychase1);

Also, I prefer   

     newobj->speed = SPDDOG;

if this is too fast, you can change to

     newobj->speed = SPDPATROL;

and then, if you want to adjust from there, change, in STEP 5, the number 2 to a different number.

            ob->speed *=2;          // go faster when chasing player

Hope I helped! I'll tidy up this post later. I'm off to work.