bundle install で以下のように怒られる。
$ sudo bundle install
Fetching gem metadata from https://rubygems.org/.......
Fetching additional metadata from https://rubygems.org/..
Using rake 0.9.2.2
Gem::Installer::ExtensionBuildError: ERROR: Failed to build gem native extension.
/System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/bin/ruby extconf.rb
checking for main() in -lc... yes
creating Makefile
make "DESTDIR="
compiling redcloth_attributes.c
compiling redcloth_inline.c
compiling redcloth_scan.c
linking shared-object redcloth_scan.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: *** [redcloth_scan.bundle] Error 1
Gem files will remain installed in /Library/Ruby/Gems/2.0.0/gems/RedCloth-4.2.9 for inspection.
Results logged to /Library/Ruby/Gems/2.0.0/gems/RedCloth-4.2.9/ext/redcloth_scan/gem_make.out
An error occurred while installing RedCloth (4.2.9), and Bundler cannot continue.
Make sure that `gem install RedCloth -v '4.2.9'` succeeds before bundling.
どうやら Xcode 5.1 へのアップデートによって clang が更新された事が原因だそうで。知らんがな。
$ sudo ARCHFLAGS=-Wno-error=unused-command-line-argument-hard-error-in-future bundle install
でいけました。
ここに詳細が載っています。-Wno-error は将来的にはサポートされなくなるっぽいですが。