openbsd-ports/devel/mingw/pkg
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$OpenBSD: README,v 1.2 2011/11/17 14:41:59 pirofti Exp $

+-----------------------------------------------------------------------
| Running ${FULLPKGNAME} on OpenBSD
+-----------------------------------------------------------------------

Environment Setup
=================
Set the mingw32 binary path before all the others. Like so:

$ export PATH=/usr/local/mingw32/bin:${PATH}

Generating PE files
===================
Just compile like you regulary would:

$ cat CreateFile_test.cpp
#include <windows.h>

int main (void)
{
        HANDLE handle;

        handle = CreateFile ("test.txt", GENERIC_READ | GENERIC_WRITE,
	    0, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);

        return 0;
}

$ g++ -L/usr/local/mingw32/lib -I/usr/local/mingw32/include \
     CreateFile_test.cpp -o CreateFile_test.exe
$ file CreateFile_test.exe
CreateFile_test.exe: MS-DOS executable PE  for MS Windows (console)
Intel 80386 32-bit