ruby - Why does "gem install passenger" fail with "undefined method `join' for nil:NilClass"? -

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using rvm v1.25.22, when try install passenger gem, fails. installing other gems, such pry, succeeds.

[nick@app02 ~] gem install passenger head http://rubygems.org/latest_specs.4.8.gz 302 moved temporarily … installing gem passenger-4.0.41 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/passenger-4.0.41/.gitignore /usr/local/rvm/gems/ruby-1.9.3-p448/gems/passenger-4.0.41/.travis.yml ... /usr/local/rvm/gems/ruby-1.9.3-p448/gems/passenger-4.0.41/test/tut/tut_reporter.h /usr/local/rvm/gems/ruby-1.9.3-p448/gems/passenger-4.0.41/test/valgrind-osx.supp building native extensions.  take while... /usr/local/rvm/rubies/ruby-1.9.3-p448/bin/ruby extconf.rb attempting download https://oss-binaries.phusionpassenger.com/binaries/passenger/by_release/4.0.41/rubyext-ruby-1.9.3-x86_64-linux.tar.gz /usr/local/rvm/gems/ruby-1.9.3-p448/gems/passenger-4.0.41/download_cache attempting download https://oss-binaries.phusionpassenger.com/binaries/passenger/by_release/4.0.41/webhelper-1.4.7-x86_64-linux.tar.gz /usr/local/rvm/gems/ruby-1.9.3-p448/gems/passenger-4.0.41/download_cache attempting download https://oss-binaries.phusionpassenger.com/binaries/passenger/by_release/4.0.41/support-x86_64-linux.tar.gz /usr/local/rvm/gems/ruby-1.9.3-p448/gems/passenger-4.0.41/download_cache make "destdir=" true make "destdir=" install true error:  while executing gem ... (nomethoderror)     undefined method `join' nil:nilclass [nick@app02 ~]   [nick@app02 ~] echo $? 1 [nick@app02 ~]

embarrassingly, asked , answered exact same question 9 months ago:

installing gems extensions fails


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