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アンチウイルスソフトの影響で ruby のインストールに失敗した

Posted at
  • macOS 10.12.6
  • rbenv v1.1.0

という環境で ruby 2.5.0 をインストールしようとしたら次のエラーが起こった:

$ rbenv install 2.5.0
ruby-build: use openssl from homebrew
Downloading ruby-2.5.0.tar.bz2...
-> https://cache.ruby-lang.org/pub/ruby/2.5/ruby-2.5.0.tar.bz2
Installing ruby-2.5.0...
ruby-build: use readline from homebrew

BUILD FAILED (OS X 10.12.6 using ruby-build 20180424)

Inspect or clean up the working tree at /var/folders/vt/h5389jvd5gn_1wcjk_jr5h080000gn/T/ruby-build.20180525230737.6484
Results logged to /var/folders/vt/h5389jvd5gn_1wcjk_jr5h080000gn/T/ruby-build.20180525230737.6484.log

Last 10 log lines:
translating probes probes.d
compiling bignum.c
compiling class.c
compiling compar.c
error: error reading '/dev/fd/9'
1 error generated.
clang: error: unable to remove file: Operation not permitted
dtrace: failed to compile script probes.d: Preprocessor failed to process input program
make: *** [probes.h] Error 1
make: *** Waiting for unfinished jobs....

すかさず error reading '/dev/fd/9' あたりでググると Avira antivirus を無効にするとインストールできるとの噂が...

Error while installing ruby 2.1.1 and newer versions (error reading '/dev/fd/9') · Issue #1074 · rbenv/rbenv · GitHub

ちょうど Avira を使っていたのでメニューの「リアルタイム保護を無効にする」から無効にして、再度インストールを試したところインストールできた :tada:
(このあと再度保護を有効にすることをお忘れなく)

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