Add instructions for updating OS X compilers (#654)

RedisGraph · Sep 20, 2019 · 872d56a · 872d56a
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diff --git a/README.md b/README.md
@@ -86,7 +86,8 @@ Requirements:
 
 * On Ubuntu Linux, run: `apt-get install build-essential cmake m4 automake peg libtool autoconf`
 
-* On OS X, verify that `homebrew` is installed and run: `brew install cmake m4 automake peg libtool autoconf`
+* On OS X, verify that `homebrew` is installed and run: `brew install cmake m4 automake peg libtool autoconf`.
+    * The version of Clang that ships with the OS X toolchain does not support OpenMP, which is a requirement for RedisGraph. One way to resolve this is to run `brew install gcc g++` and follow the on-screen instructions to update the symbolic links. Note that this is a system-wide change - setting the environment variables for `CC` and `CPP` will work if that is not an option.
 
 To build, run `make` in the project's directory.
 

diff --git a/docs/index.md b/docs/index.md
@@ -81,7 +81,8 @@ Requirements:
 
 * On Ubuntu Linux, run: `apt-get install build-essential cmake m4 automake peg libtool autoconf`
 
-* On OS X, verify that `homebrew` is installed and run: `brew install cmake m4 automake peg libtool autoconf`
+* On OS X, verify that `homebrew` is installed and run: `brew install cmake m4 automake peg libtool autoconf`.
+    * The version of Clang that ships with the OS X toolchain does not support OpenMP, which is a requirement for RedisGraph. One way to resolve this is to run `brew install gcc g++` and follow the on-screen instructions to update the symbolic links. Note that this is a system-wide change - setting the environment variables for `CC` and `CPP` will work if that is not an option.
 
 To build, run `make` in the project's directory.