Please...help me...

[ParkHaeYoung]

First, I'am sorry for my unfluent in English.
My name is Hae Young Park, student of South Korea.
You can remember Seoul Olympic on 1988.
I'm user of Visual C++ 6.0 and I compile ex9 one of
the sample problems.
It's successfully compiled and produce ex9.obj,
but I buile ex9.exe, there are a lot of errors.
For example, - 
ex9.obj : error LNK2001: unresolved external symbol "public: virtual __thiscall GASimpleGA::~GASimpleGA(void)" (??1GASimpleGA@@UAE at XZ) - and the sum of errors is 28 
I can't understand what's problem.
Please answer me what's problem if you can(I think you can)
..
And I know I must define _MSC_VER for my system.
But I don't know where I define this.
Also, frankly speaking, I can't understand whole of 
gaconfig.h. I understand a part of gaconfig.h
..
Finally, what's mean of "_", for example "_"MSC"_"VER.
..
Thank you for your reading...
Please help me...

...Sincerely
................from Hae Young Park
................"geneparks at hanmail.net"

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