Installing RoR on macOS machine

Hi,
I would like to ask if you can help me with this error while installing RoR on my mac machine running on a macOS 10.12 version.
Based on this guide https://gorails.com/setup/osx/10.12-sierra

Menj]~$ brew install rbenv
Warning: You are using OS X 10.12.
We do not provide support for this pre-release version.
You may encounter build failures or other breakages.
Please create pull-requests instead of filing issues.
==> Installing dependencies for rbenv: pkg-config, makedepend, openssl, ruby-build
==> Installing rbenv dependency: pkg-config
==> Using the sandbox
==> Downloading https://pkgconfig.freedesktop.org/releases/pkg-config-0.29.1.tar.gz
Already downloaded: /Users/Menj/Library/Caches/Homebrew/pkg-config-0.29.1.tar.gz
==> ./configure --prefix=/usr/local/Cellar/pkg-config/0.29.1_1 --disable-host-tool --with-internal-glib --
Last 15 lines from /Users/Menj/Library/Logs/Homebrew/pkg-config/01.configure:
checking for awk... awk
checking whether make sets $(MAKE)... yes
checking whether make supports nested variables... yes
checking build system type... x86_64-apple-darwin16.0.0
checking host system type... x86_64-apple-darwin16.0.0
checking how to print strings... printf
checking for style of include used by make... GNU
checking for gcc... clang
checking whether the C compiler works... yes
checking for C compiler default output file name... a.out
checking for suffix of executables...
checking whether we are cross compiling... configure: error: in `/private/tmp/pkg-config-20160831-40234-8gmr4o/pkg-config-0.29.1':
configure: error: cannot run C compiled programs.
If you meant to cross compile, use `--host'.
See `config.log' for more details

READ THIS: https://git.io/brew-troubleshooting
If reporting this issue please do so at (not Homebrew/brew):
  https://github.com/Homebrew/homebrew-core/issues

Warning: You are using OS X 10.12.
We do not provide support for this pre-release version.
You may encounter build failures or other breakages.
Please create pull-requests instead of filing issues.

Thanks!

It sounds like possibly one solution is:

I have same problem. And I fixed it by select Xcode 8 Command Line Tool in the Xcode 8. (current Xcode 7.3)

Which I found here: https://github.com/Homebrew/homebrew-core/issues/3604

Maybe try that?

Unfortunately I don't have an extra computer at the moment to install Sierra on so I'll only be able to give suggestions without testing things out myself.

Yes that's what I am doing right now Chris, downloading the xcode 8 :(

Hopefully that fixes it! Let me know how it goes.

Sure! Thanks.

Solution:

1. install xcode "command line" follow this guide -> http://osxdaily.com/2014/02/12/install-command-line-tools-mac-os-x/
2. run cleaner or if you have cleanmymac3 that would work
3. Restart
4. Start installing - Read & Follow this guide -> https://gorails.com/setup/osx/10.12-sierra

Another resources if your server can't connect to your repo.
https://forum.upcase.com/t/capistrano-cannot-read-from-remote-repository/3009/4

Enjoy!
;)