[Solved] Problem with Fire Walls (Like EoD)

It seems that i ran into problems more often than ever....
Oh, well. I wanted to add the Fire wall feature to my Hell Rising mod. I belive the idea came from Rise of the Triad and done in End Of Destiny. I provide a tutorial what i've tried out: http://diehardwolfers.areyep.com/viewtopic.php?t=4487

When i try to compile the exe, these errors came in:

Code:

wl_act2.cpp In function `void T_Projectile(objtype*)': 
Line: 328 wl_act2.cpp `check' undeclared (first use this function) 
(Each undeclared identifier is reported only once for each function it appears in.) 
Makefile.win [Build Error]  [wl_act2.o] Error 1 

Note that i also done some necessary "Dos to SDL converting", as described here: http://diehardwolfers.areyep.com/viewtopic.php?t=6918&highlight=fire+wall

But i still get these errors. Any solutions?

In the T_Projectile function, underneath 'int32_t speed;', add 'objtype *check'. Does that fix it?

Well, almost....it now gives me more errors (at least, different ones)

wl_play.cpp In function `void PlayLoop()': 
Line: 1325 wl_play.cpp `FireScan' undeclared (first use this function) 
(Each undeclared identifier is reported only once for each function it appears in.) 
wl_play.cpp In function `void FireScan()': 
Line: 1377 wl_play.cpp `void FireScan()' used prior to declaration 
Makefile.win [Build Error]  [wl_play.o] Error 1

In the beginning of WL_PLAY, underneath 'void PlayLoop (void);', add 'void FireScan (void);'.

Compiled successfully.
Just tried it out, and it works perfectly!
Thanks a lot!