brew install php55-intl fails, Cant Install Composer - php

Question

I'm trying to install npm install && grunt, however it tells me that I need composer. I'm trying to install composer but that's dependent on php55.
I've tried brew install php55, php55-intl, php56, php56-intl, etc.
I am reading the instructions from here: https://getcomposer.org/doc/00-intro.md
It states that for a Mac I should simply use brew commands:
brew update brew tap
homebrew/homebrew-php
brew tap homebrew/dupes
brew tap homebrew/versions
brew install php55-intl #fails here
brew install homebrew/php/composer
I am getting the following error:
brew install php55-intl
==> Installing dependencies for php55-intl: php55, icu4c
==> Installing php55-intl dependency: php55
==> Downloading http://www.php.net/get/php-5.5.15.tar.bz2/from/this/mirror Already
downloaded: /Library/Caches/Homebrew/php55-5.5.15
==> ./configure --prefix=/usr/local/Cellar/php55/5.5.15 --localstatedir=/usr/local/var --sysconfdir=/usr/local/etc/php/5.5 --with-config-file-path=/usr/local/etc/php/5.5 --with-config-file-scan-dir=/usr/local/etc/php/5.5/conf.d -- checking for png_write_image in -lpng... yes If configure fails try
--with-xpm-dir= checking for fabsf... yes checking for floorf... yes configure: error: GD build test failed. Please check the
config.log for details.
READ THIS: https://github.com/Homebrew/homebrew/wiki/troubleshooting
If reporting this issue please do so at (not Homebrew/homebrew):
https://github.com/homebrew/homebrew-php/issues
/System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/rubygems/core_ext/kernel_require.rb:55:in
require': Class is not a module (TypeError) from
/System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/rubygems/core_ext/kernel_require.rb:55:in
require' from
/System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/net/http.rb:390:in
<class:HTTP>' from
/System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/net/http.rb:384:in
' from
/System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/net/http.rb:25:in
<top (required)>' from
/System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/rubygems/core_ext/kernel_require.rb:55:in
require' from
/System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/rubygems/core_ext/kernel_require.rb:55:in
require' from
/System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/net/https.rb:21:in
' from
/System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/rubygems/core_ext/kernel_require.rb:55:in
require' from
/System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/rubygems/core_ext/kernel_require.rb:55:in
require' from /usr/local/Library/Homebrew/utils.rb:308:in open'
from /usr/local/Library/Homebrew/utils.rb:350:inissues_matching'
from /usr/local/Library/Homebrew/utils.rb:378:in issues_for_formula'
from /usr/local/Library/Homebrew/exceptions.rb:171:infetch_issues'
from /usr/local/Library/Homebrew/exceptions.rb:167:in issues' from
/usr/local/Library/Homebrew/exceptions.rb:207:indump' from
/usr/local/Library/brew.rb:158:in rescue in <main>' from
/usr/local/Library/brew.rb:66:in'
Does anyone know another work around? I've tried curl commands but they never run, and I can't run the exe on my mac.
Thanks!

Answer 1

Solution:
Upgrade to the latest version of XCode
Make sure you reinstall XCode CLT: xcode-select --install
Update your formulae: brew update
Remove zlib: brew rm zlib
Install / reinstall php55: brew install php55 (as zlib is a dependency, it will be reinstalled)
Followed by brew install composer
Found here: https://github.com/Homebrew/homebrew-php/issues/610
I needed to update my Xcode, and then everything ran.