update setup.py to allow "wheel" construction on mac (#1088)

* update setup.py to allow "wheel" construction on mac

* PR feedback

---------

Co-authored-by: andy <andy@neuralmagic.com>

setup.py

@@ -180,13 +180,17 @@ def _check_supported_system():
         )
 
     if sys.platform.startswith("darwin"):
-        # mac is not supported, raise error on install
-        raise OSError(
-            "Native Mac is currently unsupported for DeepSparse. "
-            "Please run on a Linux system or within a Linux container on Mac. "
-            "More info can be found in our docs here: "
-            "https://docs.neuralmagic.com/deepsparse/source/hardware.html"
-        )
+        if os.getenv("NM_ALLOW_DARWIN", "0") != "0":
+            # experimental support for mac, allow install to go through
+            return
+        else:
+            # mac is not supported, raise error on install
+            raise OSError(
+                "Native Mac is currently unsupported for DeepSparse. "
+                "Please run on a Linux system or within a Linux container on Mac. "
+                "More info can be found in our docs here: "
+                "https://docs.neuralmagic.com/deepsparse/source/hardware.html"
+            )
 
     # unknown system, raise error on install
     raise OSError(