Note gnudiff dependency.

dgentry · Nov 22, 2019 · 531f851 · 531f851
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@@ -64,12 +64,20 @@ which only deletes identical files (not older ones that differ).
 
 
 ## To install
+On Mac, install GNU diff.
+```
+brew install gnudiff
+```
+
+
 ```
 make install
 ```
 
 If there is interest, I'll put it on pypi.
 
+
+
 ## Developer Notes
 Packaged according to this scheme, which seems extremely sensible:
 https://blog.ionelmc.ro/2014/05/25/python-packaging