Add gflags to Mac build from source instructions

Note that gflags is already listed as something to install under Linux before build from source and running tests but was not included on Mac.
yapkke · Apr 28, 2017 · 75d2496 · 75d2496
1 parent b40a86f
commit 75d2496
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diff --git a/INSTALL.md b/INSTALL.md
@@ -46,6 +46,11 @@ packages, which you can get from [Homebrew](https://brew.sh):
  $ brew install autoconf automake libtool shtool
 ```
 
+If you plan to build from source and run tests, install the following as well:
+```sh
+ $ brew install gflags
+```
+
 ## Protoc
 
 By default gRPC uses [protocol buffers](https://github.com/google/protobuf),