How to specify an output folder in elixir_make on windows?

I’m able to compile successfully on windows, but all output files are written to project_root, not /priv

Do i need to modify Makefile.win? or is there a config step i have missed?

Makefile.win

all: tgx_nif.dll

tgx_nif.dll:
  cl.exe /I "C:/Program Files/erl-23.0/erts-11.0/include/" /LD src/tgx_nif.c

log

C:\Projects\tgx_nif>mix compile --verbose
==> elixir_make
Compiling 1 file (.ex)
Generated elixir_make app
==> tgx_nif
Compiling with make: nmake /F Makefile.win

Microsoft (R) Program Maintenance Utility Version 14.26.28805.0
Copyright (C) Microsoft Corporation.  All rights reserved.

        cl.exe /I "C:/Program Files/erl-23.0/erts-11.0/include/" /LD src/tgx_nif.c
Microsoft (R) C/C++ Optimizing Compiler Version 19.26.28805 for x64
Copyright (C) Microsoft Corporation.  All rights reserved.

tgx_nif.c
Microsoft (R) Incremental Linker Version 14.26.28805.0
Copyright (C) Microsoft Corporation.  All rights reserved.

/out:tgx_nif.dll
/dll
/implib:tgx_nif.lib
tgx_nif.obj
   Creating library tgx_nif.lib and object tgx_nif.exp
Compiling 1 file (.ex)
Compiled lib/tgx_nif.ex
Generated tgx_nif app
Consolidated List.Chars
Consolidated Collectable
Consolidated IEx.Info
Consolidated String.Chars
Consolidated Enumerable
Consolidated Inspect

C:\Projects\tgx_nif>

Thanks.