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 bcrypt-ruby: ERROR: Failed to build gem native extension. 

I'm running OSX 10.6.7 with Ruby under RVM. I reinstalled the lastest version of xcode & reinstalled Ruby 64bit, Rails and all the gems.

Answer 1

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 2

Looks like there might be some info missing here - for me, this was due to a brew install of gcc. gcc was in /usr/bin, but not gcc-4.2. So I just did the following:

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

which creates a link, gcc-4.2, which the gem is looking for that goes back to gcc.

Hope that helps.