README.md updates

Author: dominicletz

README.md

@@ -11,10 +11,17 @@ This xcode project wraps the [Desktop Sample App](https://github.com/elixir-desk
 
 1. Install Erlang-OTP (with openssl) in the same version 25.0.4 as the bundled runtime edition:
 
+    ```
+    asdf install erlang 25.0.4
+    asdf install elixir 1.13.4-otp-25
+    ```
+
+    If above fails for you on an older mac or can't seem to find openssl you can try this custom build command as well:
+
     ```
     export DED_LDFLAGS_CONFTEST="-bundle"
     export KERL_CONFIGURE_OPTIONS="--without-javac --with-ssl=$(brew --prefix openssl@1.1)"
-    asdf install erlang 25.0.4 --with-ssl=$(brew --prefix openssl@1.1)`
+    asdf install erlang 25.0.4
     asdf install elixir 1.13.4-otp-25
     ```