Gnustep for windowns version problem

[Donnie Luis]

I installed Gnustep with windows installer and MinGW was installed.
When I program console code which print "hello world", it works fine.
But ***libmingw32.a(main.o)(.text+0x97):main.c: undefined reference to
`WinMain@16'*** error occur if I program gui code. Need I add library
information for link with WinMain to somewhere?
What's problem and how can I solve it?