Add instructions about PCRE for macOS

Summary: This should resolve #8 and #6. Reviewed By: xich Differential Revision: D5000220 fbshipit-source-id: b713931
facebook · May 4, 2017 · 6327b61 · 6327b61
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commit 6327b61
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diff --git a/README.md b/README.md
@@ -12,6 +12,12 @@ Duckling is a Haskell library that parses text into structured data.
 A Haskell environment is required. We recommend using
 [stack](https://haskell-lang.org/get-started).
 
+On macOS you'll need to install PCRE development headers.
+The easiest way to do that is with [Homebrew](https://brew.sh/):
+```
+brew install pcre
+```
+
 ## Quickstart
 To compile and run the binary:
 ```