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rbenvでrubyをインストールできない

Last updated at Posted at 2016-01-05

##環境
OSX ElCapitan(10.11.2)

##はまったとこ
rbenvでruby2.2.2をインストール...できない

$ rbenv install 2.2.2
 Downloading ruby-2.2.2.tar.bz2...
 -> https://cache.ruby-lang.org/pub/ruby/2.2/ruby-2.2.2.tar.bz2
 Installing ruby-2.2.2...
 
 BUILD FAILED (OS X 10.11.2 using ruby-build 20151230)
 
 Inspect or clean up the working tree at /var/folders/v6/hwyn6rq15p73fn962_y21hkc0000gn/T/ruby-build.20160106042805.26781
Results logged to /var/folders/v6/hwyn6rq15p73fn962_y21hkc0000gn/T/ruby-build.20160106042805.26781.log
Last 10 log lines:
/var/folders/v6/hwyn6rq15p73fn962_y21hkc0000gn/T/ruby-build.20160106042805.26781 ~/rails_projects/TwitterRanking
/var/folders/v6/hwyn6rq15p73fn962_y21hkc0000gn/T/ruby-build.20160106042805.26781/ruby-2.2.2 /var/folders/v6/hwyn6rq15p73fn962_y21hkc0000gn/T/ruby-build.20160106042805.26781 ~/rails_projects/TwitterRanking
config.guess already exists
config.sub already exists
checking build system type... x86_64-apple-darwin15.2.0
checking host system type... x86_64-apple-darwin15.2.0
checking target system type... x86_64-apple-darwin15.2.0
./configure: line 3696: /usr/bin/gcc-4.2: No such file or directory
configure: error: clang version 3.0 or later is required
make: *** No targets specified and no makefile found.  Stop.

最後のあたりを見ると、/usr/bin/gcc-4.2がないのと、
clangが3.0以上じゃないとダメ?みたいな?よくわからなくてつらい...
とりあえず

$ clang -v
Apple LLVM version 7.0.2 (clang-700.1.81)
Target: x86_64-apple-darwin15.2.0
Thread model: posix

あるし、、
んじゃあもう一つの方の./configure: line 3696: /usr/bin/gcc-4.2: No such file or directoryってのは、、、

$ ls /usr/bin

でわかるけど、確かにgcc-4.2はない。ではどうすれば?てことでググると、
http://stackoverflow.com/questions/12256616/os-x-mountain-lion-gcc-4-2-no-such-file-or-directory
こんなstackoverflowを発見。
sudo ln -s /usr/bin/gcc /usr/bin/gcc-4.2
こんな感じでシンボリックリンクを貼れば直るらしい、

$ sudo ln -s /usr/bin/gcc /usr/bin/gcc-4.2
Password:
ln: /usr/bin/gcc-4.2: Operation not permitted

rootless.....

う〜〜ん詰み、、、ってとこで、coa00@githubさんの
http://qiita.com/coa00@github/items/b50d06980187b0685349
こんな記事を発見、、これの通りに、~/.zshenv
export CC=/usr/bin/gcc
ってのを追加、、、、

####通った、、、、

おわり

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