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UPDATE：当我使用sudo（例如sudo rbenv install jruby-9.1.2.0）时，一切正常。但我不想那:)。JRuby安装失败，除非sudo带有“undefined local variable或method`r for main：Object”
$ ruby -v
NameError: undefined local variable or method `v' for main:Object
<top> at -v:1
$ sudo ruby -v
jruby 9.1.2.0 (2.3.0) 2016-05-26 7357c8f Java HotSpot(TM) 64-Bit Server VM 25.51-b03 on 1.8.0_51-b16 +jit [darwin-x86_64]
寻找到哪里寻找什么东西（一个或多个）都要求在安装过程中提示sudo。 C Ruby安装/运行得很好，没有sudo。
试图安装JRuby，但得到问题，即-r标志被解释为一个变量。使用rvm和JRuby 1.7.x版本时出现类似的问题。同事没有任何相同的问题。以前能够使用rvm和rbenv安装JRuby 1.7，并且从那时起我不知道系统上发生了什么变化。试用JAVA_HOME设置为1.7和1.8版本，结果相同。
我找不出什么在我的系统上导致这是一个问题 - 寻找重新成像之前的故障排除的想法:)。
rbenv install -v jruby-9.1.2.0
/var/folders/qt/xqr8qztj5tl94l0r3l9t0pm4zbpz12/T/ruby-build.20170420180901.3389 ~
Downloading jruby-bin-9.1.2.0.tar.gz...
HTTP/1.1 200 OK
Content-Type: binary/octet-stream
Content-Length: 32578117
Connection: keep-alive
Date: Thu, 20 Apr 2017 18:41:50 GMT
Last-Modified: Fri, 27 May 2016 22:23:15 GMT
ETag: "749bb917dde9666e365e12bbe776a5c2"
Accept-Ranges: bytes
Server: AmazonS3
Age: 16032
X-Cache: Hit from cloudfront
Via: 1.1 0b1b12cfcb11f71988a190f16ef65179.cloudfront.net (CloudFront)
X-Amz-Cf-Id: mKmI9h4xs22ajaNTInTyIeqrnwQw1XHOJzcbKc--yknq4CUOu3XUmg==
-> https://dqw8nmjcqpjn7.cloudfront.net/60598a465883ab4c933f805de4a7f280052bddc793b95735465619c03ca43f35
/var/folders/qt/xqr8qztj5tl94l0r3l9t0pm4zbpz12/T/ruby-build.20170420180901.3389/jruby-9.1.2.0 /var/folders/qt/xqr8qztj5tl94l0r3l9t0pm4zbpz12/T/ruby-build.20170420180901.3389 ~
Installing jruby-9.1.2.0...
Building native extensions. This could take a while...
ERROR: Error installing jruby-launcher:
ERROR: Failed to build gem native extension.
current directory: /Users/username/.rbenv/versions/jruby-9.1.2.0/lib/ruby/gems/shared/gems/jruby-launcher-1.1.2-java
/Users/username/.rbenv/versions/jruby-9.1.2.0/bin/jruby -r ./siteconf20170420-3455-1f44pgz.rb extconf.rb
NameError: undefined local variable or method `r' for main:Object
<top> at -r:1
extconf failed, exit code 1
Gem files will remain installed in /Users/username/.rbenv/versions/jruby-9.1.2.0/lib/ruby/gems/shared/gems/jruby-launcher-1.1.2-java for inspection.
Results logged to /Users/username/.rbenv/versions/jruby-9.1.2.0/lib/ruby/gems/shared/extensions/universal-java-1.7/2.3.0/jruby-launcher-1.1.2-java/gem_make.out
BUILD FAILED (OS X 10.11.6 using ruby-build 20170322)
Inspect or clean up the working tree at /var/folders/qt/xqr8qztj5tl94l0r3l9t0pm4zbpz12/T/ruby-build.20170420180901.3389
Results logged to /var/folders/qt/xqr8qztj5tl94l0r3l9t0pm4zbpz12/T/ruby-build.20170420180901.3389.log
Last 10 log lines:
current directory: /Users/username/.rbenv/versions/jruby-9.1.2.0/lib/ruby/gems/shared/gems/jruby-launcher-1.1.2-java
/Users/username/.rbenv/versions/jruby-9.1.2.0/bin/jruby -r ./siteconf20170420-3455-1f44pgz.rb extconf.rb
NameError: undefined local variable or method `r' for main:Object
<top> at -r:1
extconf failed, exit code 1
Gem files will remain installed in /Users/username/.rbenv/versions/jruby-9.1.2.0/lib/ruby/gems/shared/gems/jruby-launcher-1.1.2-java for inspection.
Results logged to /Users/username/.rbenv/versions/jruby-9.1.2.0/lib/ruby/gems/shared/extensions/universal-java-1.7/2.3.0/jruby-launcher-1.1.2-java/gem_make.out
这里是我的OS信息
$ uname -a
Darwin username-mbp 15.6.0 Darwin Kernel Version 15.6.0: Fri Feb 17 10:21:18 PST 2017; root:xnu-3248.60.11.4.1~1/RELEASE_X86_64 x86_64
也有问题与JRuby的发射器，但不知道这只是一个症状：
$ gem install jruby-launcher
ERROR: Could not find a valid gem 'jruby-launcher' (>= 0) in any repository
ERROR: Possible alternatives: tmux_launcher, RubyRun_CE, ass_launcher, ec2launcher, jruby-ehcache
你在哪里传递'-r'标志？ – Jacob
这些都是作为'rbenv'或'rvm'安装的一部分完成的 - 我刚刚运行'rbenv install -v jruby-9.1.2.0' – eebbesen
这只发生在El Capitan上启用FileVault之后。在启用FileVault之前，JRuby的安装和使用如预期的那样。 – eebbesen