# Cannot install Mongrel gem w ruby-1.9.2-preview3 \[ x86\_64 \] and Rails 3.0.0.beta4 \[OS X 10.6.4\] **URL:** \ **Category:** Rails\ **Created:** [June 17, 2010, 11:43pm UTC](https://www.ruby-forum.com/t/cannot-install-mongrel-gem-w-ruby-1-9-2-preview3-x86-64-and-rails-3-0-0-beta4-os-x-10-6-4/190337 "2010-06-17T23:43:27Z")\ **Posts on this page:** 7\ **Page:** 1
**Author:** ![kadoudal](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/k/f0a364/32.png) [@kadoudal](https://www.ruby-forum.com/u/kadoudal)\ **Post date:** [June 17, 2010, 11:43pm UTC](https://www.ruby-forum.com/t/cannot-install-mongrel-gem-w-ruby-1-9-2-preview3-x86-64-and-rails-3-0-0-beta4-os-x-10-6-4/190337/1 "2010-06-17T23:43:27Z")
error in make … yves$ sudo gem install mongrel Building native extensions. This could take a while… ERROR: Error installing mongrel: ERROR: Failed to build gem native extension. /Users/yves/.rvm/rubies/ruby-1.9.2-preview3/bin/ruby extconf.rb checking for main() in -lc… yes creating Makefile make gcc -I. -I/Users/yves/.rvm/rubies/ruby-1.9.2-preview3/include/ ruby-1.9.1/x86\_64-darwin10.4.0 -I/Users/yves/.rvm/rubies/ruby-1.9.2- preview3/include/ruby-1.9.1/ruby/backward -I/Users/yves/.rvm/rubies/ ruby-1.9.2-preview3/include/ruby-1.9.1 -I. -D\_XOPEN\_SOURCE - D\_DARWIN\_C\_SOURCE -fno-common -O3 -ggdb -Wextra -Wno-unused- parameter -Wno-parentheses -Wpointer-arith -Wwrite-strings -Wno- missing-field-initializers -Wshorten-64-to-32 -Wno-long-long -fno- common -pipe -o http11.o -c http11.c http11.c: In function ‘http\_field’: http11.c:70: warning: format not a string literal and no format arguments http11.c:71: warning: format not a string literal and no format arguments http11.c:77: error: ‘struct RString’ has no member named ‘ptr’ http11.c:77: error: ‘struct RString’ has no member named ‘len’ ---
**Author:** ![kadoudal](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/k/f0a364/32.png) [@kadoudal](https://www.ruby-forum.com/u/kadoudal)\ **Post date:** [June 18, 2010, 4:51pm UTC](https://www.ruby-forum.com/t/cannot-install-mongrel-gem-w-ruby-1-9-2-preview3-x86-64-and-rails-3-0-0-beta4-os-x-10-6-4/190337/2 "2010-06-18T16:51:57Z")
Looking at your error “gcc -I. -I/Users/yves/.rvm/rubies/ruby-1.9.2-preview3/include/ruby-1.9.1/x86\_64-darwin10.4.0” Do you see that there are 2 ruby versions there? RVM suggests you to always install gems without “sudo” (or if you installed your first one with sudo, keep doing that forever). Try to play around using: ruby -v sudo ruby -v gem list sudo gem list And Rails dev-core said that you should not use ruby 1.9.1 with Rails 3.0beta because of seg fault errors. 1.9.2 works just great. – Fernando B. ---
**Author:** ![kadoudal](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/k/f0a364/32.png) [@kadoudal](https://www.ruby-forum.com/u/kadoudal)\ **Post date:** [June 20, 2010, 9:53am UTC](https://www.ruby-forum.com/t/cannot-install-mongrel-gem-w-ruby-1-9-2-preview3-x86-64-and-rails-3-0-0-beta4-os-x-10-6-4/190337/3 "2010-06-20T09:53:30Z")
I’m having the same issue and installed gems without user sudo. Fernando B. wrote: > Looking at your error > “gcc -I. > -I/Users/yves/.rvm/rubies/ruby-1.9.2-preview3/include/ruby-1.9.1/x86\_64-darwin10.4.0” > > Do you see that there are 2 ruby versions there? > RVM suggests you to always install gems without “sudo” (or if you > installed > your first one with sudo, keep doing that forever). ---
**Author:** ![kadoudal](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/k/f0a364/32.png) [@kadoudal](https://www.ruby-forum.com/u/kadoudal)\ **Post date:** [June 20, 2010, 11:17am UTC](https://www.ruby-forum.com/t/cannot-install-mongrel-gem-w-ruby-1-9-2-preview3-x86-64-and-rails-3-0-0-beta4-os-x-10-6-4/190337/4 "2010-06-20T11:17:04Z")
Anthony G. wrote: > I’m having the same issue and installed gems without user sudo. > > Fernando B. wrote: > > > Looking at your error > > “gcc -I. > > -I/Users/yves/.rvm/rubies/ruby-1.9.2-preview3/include/ruby-1.9.1/x86\_64-darwin10.4.0” > > > > Do you see that there are 2 ruby versions there? > > RVM suggests you to always install gems without “sudo” (or if you > > installed > > your first one with sudo, keep doing that forever). After doing some further testing with RVM installs of 1.8.7 will let you install mongrel, whereas installs 1.9.1 and 1.9.2 won’t. ---
**Author:** ![kadoudal](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/k/f0a364/32.png) [@kadoudal](https://www.ruby-forum.com/u/kadoudal)\ **Post date:** [July 1, 2010, 12:55pm UTC](https://www.ruby-forum.com/t/cannot-install-mongrel-gem-w-ruby-1-9-2-preview3-x86-64-and-rails-3-0-0-beta4-os-x-10-6-4/190337/5 "2010-07-01T12:55:05Z")
I had problem even though I had installed mongrel --pre. In Gemfile you need to specifically point mongrel to use “1.2.0.pre2” or else it will try to use the old version, even if you remove it from the cache. ---
**Author:** ![kadoudal](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/k/f0a364/32.png) [@kadoudal](https://www.ruby-forum.com/u/kadoudal)\ **Post date:** [July 1, 2010, 12:55pm UTC](https://www.ruby-forum.com/t/cannot-install-mongrel-gem-w-ruby-1-9-2-preview3-x86-64-and-rails-3-0-0-beta4-os-x-10-6-4/190337/6 "2010-07-01T12:55:40Z")
I had problem even though I had installed mongrel --pre. In Gemfile you need to specifically point mongrel to use “1.2.0.pre2” or else it will try to use the old version, even if you remove it from the cache. ---
**Author:** ![kadoudal](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/k/f0a364/32.png) [@kadoudal](https://www.ruby-forum.com/u/kadoudal)\ **Post date:** [June 20, 2010, 11:22am UTC](https://www.ruby-forum.com/t/cannot-install-mongrel-gem-w-ruby-1-9-2-preview3-x86-64-and-rails-3-0-0-beta4-os-x-10-6-4/190337/7 "2010-06-20T11:22:19Z")
More digging and the answer is to install monrel pre-release gem install mongrel --pre Anthony G. wrote: > Anthony G. wrote: > > > I’m having the same issue and installed gems without user sudo. > > > > Fernando B. wrote: > > > > > Looking at your error > > > “gcc -I. > > > -I/Users/yves/.rvm/rubies/ruby-1.9.2-preview3/include/ruby-1.9.1/x86\_64-darwin10.4.0” > > > > > > Do you see that there are 2 ruby versions there? > > > RVM suggests you to always install gems without “sudo” (or if you > > > installed > > > your first one with sudo, keep doing that forever). > > After doing some further testing with RVM installs of 1.8.7 will let you > install mongrel, whereas installs 1.9.1 and 1.9.2 won’t.