Installing jekyll on OSX Mavericks with Xcode 5.1

gistfile1.txt

###### When trying to install Jekyll with Xcode 5.1 I was getting the following error. ######

Foo:~ john$ gem install jekyll
Password:
Building native extensions.  This could take a while...
ERROR:  Error installing jekyll:
        ERROR: Failed to build gem native extension.
 
    /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/bin/ruby extconf.rb
creating Makefile
 
make "DESTDIR=" clean
 
make "DESTDIR="
compiling porter.c
porter.c:359:27: warning: '&&' within '||' [-Wlogical-op-parentheses]
      if (a > 1 || a == 1 && !cvc(z, z->k - 1)) z->k--;
                ~~ ~~~~~~~^~~~~~~~~~~~~~~~~~~~
porter.c:359:27: note: place parentheses around the '&&' expression to silence this warning
      if (a > 1 || a == 1 && !cvc(z, z->k - 1)) z->k--;
                          ^
                   (                          )
1 warning generated.
compiling porter_wrap.c
linking shared-object stemmer.bundle
clang: error: unknown argument: '-multiply_definedsuppress' [-Wunused-command-line-argument-hard-error-in-future]
clang: note: this will be a hard error (cannot be downgraded to a warning) in the future
make: *** [stemmer.bundle] Error 1
 
make failed, exit code 2
 
Gem files will remain installed in /Library/Ruby/Gems/2.0.0/gems/fast-stemmer-1.0.2 for inspection.
Results logged to /Library/Ruby/Gems/2.0.0/extensions/universal-darwin-13/2.0.0/fast-stemmer-1.0.2/gem_make.out

###### This solved it for me. Didn't see it documented elsewhere yet. ######

Foo:~ john$ ARCHFLAGS=-Wno-error=unused-command-line-argument-hard-error-in-future gem install jekyll