--- a/setup.py.old	2020-08-12 13:00:24.000000000 -0700
+++ a/setup.py	2020-08-13 14:43:57.723209700 -0700
@@ -178,9 +178,9 @@
     # Set various flags for use in TBB and openmp. On OSX, also find OpenMP!
     have_openmp = True
     if sys.platform.startswith('win'):
-        cpp11flags = []
-        ompcompileflags = ['-openmp']
-        omplinkflags = []
+        cpp11flags = ['-std=c++11']
+        ompcompileflags = ['-fopenmp']
+        omplinkflags = ['-fopenmp']
     elif sys.platform.startswith('darwin'):
         cpp11flags = ['-std=c++11']
         # This is a bit unusual but necessary...