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@@ -17,8 +17,8 @@
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 require 'rubygems/source_info_cache'
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+require 'stringio' # for Gem::RemoteFetcher
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-
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 def windows?
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   Config::CONFIG['host_os'] =~ /windows|cygwin|bccwin|cygwin|djgpp|mingw|mswin|wince/i
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 end
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@@ -38,11 +38,12 @@
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 def install_gem(name, ver_requirement = nil)
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   dep = Gem::Dependency.new(name, ver_requirement)
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+  rb_bin = File.join(Config::CONFIG['bindir'], Config::CONFIG['ruby_install_name'])
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   if Gem::SourceIndex.from_installed_gems.search(dep).empty?
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     spec = Gem::SourceInfoCache.search(dep).last
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     fail "#{dep} not found in local or remote repository!" unless spec
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     puts "Installing #{spec} ..."
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-    args = [Config::CONFIG['ruby_install_name'], '-S', 'gem', 'install', spec.name, '-v', spec.version.to_s]
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+    args = [rb_bin, '-S', 'gem', 'install', spec.name, '-v', spec.version.to_s]
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     args.unshift('sudo', 'env', 'JAVA_HOME=' + ENV['JAVA_HOME']) unless windows?
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     sh *args
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   end