Why do I get a bcrypt-ruby gem install error?

Question

Getting an error when trying to install the gem devise, the installation is stopping on the gem bcrypt-ruby:

$ gem install bcrypt-ruby
Error installing bcry         


        

Answer 1

I'm using RVM & I kept having this issue whenever installing gems with native extensions (bcrypt-ruby, bson-ext, json, eventmachine, nokogiri, linecache19, etc.)

Gem::Installer::ExtensionBuildError: ERROR: Failed to build gem native extension.

Only way I could finally get things working was to uninstall then re-install ruby.

rvm remove 1.9.2

rvm install 1.9.2

Thanks to tip from @doublebee here: https://github.com/flori/json/issues/78#issuecomment-1499920

Answer 2

You only need use rvm (ruby version manager)

rvm uninstall 1.9.3

and then

rvm install 1.9.3

looks this error is on build of rvm 1.9.3, but uninstall and reinstalling fix the problem with bcrypt-ruby 3.0.1

Answer 3

I had the same problem installing under OSX 10.7.3. When installing the gem, my error message was:

Building native extensions.  This could take a while...
ERROR:  Error installing bcrypt-ruby:
ERROR: Failed to build gem native extension.

creating Makefile

make
compiling bcrypt_ext.c
make: /usr/bin/gcc-4.2: No such file or directory
make: *** [bcrypt_ext.o] Error 1

Looks like the gem is looking for gcc-4.2 but I only had a file called gcc. Now since I had just installed the latest Xcode (4.3), I knew that my C compiler was compliant but the gem had gcc-4.2 hardcoded into it. So my solution was:

sudo ln -s /usr/bin/gcc /usr/bin/gcc-4.2

The linking worked like a charm.

Answer 4

I think you need to reinstall bundler gem.

gem install bundler and then bundle install