ruby - Rails bundle install - failed to build gem native extension for JSON -

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i trying fix strange problem in rails resorted uninstalling gems (using command found here: http://geekystuff.net/2009/01/14/remove-all-ruby-gems/) , running bundle install.

the removal successful, when ran bundle install, got following error:

installing activeresource (3.2.13)

using bundler (1.3.5) installing rack-ssl (1.3.3)

installing json (1.8.0)

gem::installer::extensionbuilderror: error: failed build gem native extension .

    c:/railsinstaller/ruby1.9.3/bin/ruby.exe extconf.rb creating makefile

make

generating generator-i386-mingw32.def

compiling generator.c

linking shared-object json/ext/generator.so

make install

/usr/bin/install -c -m 0755 generator.so c:/railsinstaller/ruby1.9.3/lib/ruby/ge ms/1.9.1/gems/json-1.8.0/lib/json/ext /usr/bin/install: cannot remove `c:/railsinstaller/ruby1.9.3/lib/ruby/gems/1.9.1 /gems/json-1.8.0/lib/json/ext/generator.so': permission denied make: *** [c:/railsinstaller/ruby1.9.3/lib/ruby/gems/1.9.1/gems/json-1.8.0/lib/j son/ext/generator.so] error 1

gem files remain installed in c:/railsinstaller/ruby1.9.3/lib/ruby/gems/1.9 .1/gems/json-1.8.0 inspection.

results logged c:/railsinstaller/ruby1.9.3/lib/ruby/gems/1.9.1/gems/json-1.8. 0/ext/json/ext/generator/gem_make.out error occurred while installing json (1.8.0), , bundler cannot continue.

make sure gem install json -v '1.8.0' succeeds before bundling.

i've spent fair amount of time still can't figure out what's wrong. please advise.

i downloaded , ran rails installer. time when ran bundle install, problem gone.


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