[Mingw-users] error in compiling opencv 2.1 with gcc 4.5.0

[zwz <zha...@gm...>]

Hi, I just checked out the latest opencv 2.1 and generated the makefile
for msys.

And then I tried to compile it by gcc 4.5.0, with the error: 
[ 0%] Generating precomp.hpp.gch/opencv_imgproc_Release.gch
d:/gnu/mingw/bin/../lib/gcc/mingw32/4.5.0/../../../libmingw32.a(main.o):main.c:(.text+0xd2):
undefined reference to `WinMain@16' 
collect2: ld returned 1 exit status

However, if I turn to gcc 4.4.0, it compiles successfully.

I am quite confused now about where the problem is.
Is the error caused by opencv or gcc?