--- setup.py        2022-01-09 04:24:16.336090329 -0800
+++ setup.py    2022-01-09 04:24:42.124350480 -0800
@@ -5,6 +5,8 @@
 
 ON_WINDOWS = platform.system() == 'Windows'
 _comp_args = ["DSHARED=1"]
+if ON_WINDOWS:
+    _comp_args += ["DMSC_USE_DLL=1", "DMPIR=1"]
 sources = ['src/gmpy2.c']
 
 # Utility function to read the contents of the README file.