Issues with undefined symbols when using Vibe on Windows

[Chris M.]

This doesn't appear to specifically be a Vibe issue, just 
noticing this error when I use eventcore from it (trying to use 
async).

C:\dmd2\windows\bin\lld-link.exe: warning: 
eventcore.lib(sockets_101f_952.obj): undefined symbol: 
SetWindowLongPtrA
C:\dmd2\windows\bin\lld-link.exe: warning: 
eventcore.lib(sockets_101f_952.obj): undefined symbol: 
GetWindowLongPtrA

I'm using DMD 2.080 from the zip file provided on the downloads 
page, plus DMC (unfortunately acquiring a Visual Studio license 
would not be easy at my workplace, and I don't see how to use the 
provided DMD installer without it). As far as I can tell, this 
issue seems to be happening because user32.lib from the 
windows/lib64/mingw folder does not define these two functions. 
Seems to work when I build the project as 32-bit though. 
Wondering if someone could double-check my reasoning here.