Question

I created a VM running the latest Ubuntu because it was causing so many problems on my Windows machine.

I got RVM installed, have versions 1.8.7 and 1.9.2 setup with 1.9.2 as the default. I installed gems, installed Rails.

If I try to do anything with Rails (generate, server, etc.) I get this error:

You have requested: mysql2 ~> 0.2.6

The bundle currently has mysql2 locked
at 0.2.6. Try running bundle update
mysql2

First problem, my rails app isn’t even using mysql. It’s using SQLite.
Anyway, I run bundle update mysql2 like it says…and I get a bunch of errors. The start of them is this:

Installing mysql2 (0.2.6) with native extensions /home/jamesw/.rvm/rubies/ruby-1.9.2-p180/lib/ruby/site_ruby/1.9.1/rubygems/installer.rb:533:in `rescue in block in build_extensions': ERROR: Failed to build gem native extension. (Gem::Installer::ExtensionBuildError)

        /home/jamesw/.rvm/rubies/ruby-1.9.2-p180/bin/ruby extconf.rb 
checking for rb_thread_blocking_region()... yes
checking for mysql_query() in -lmysqlclient... no
checking for main() in -lm... yes
checking for mysql_query() in -lmysqlclient... no
checking for main() in -lz... yes
checking for mysql_query() in -lmysqlclient... no
checking for main() in -lsocket... no
checking for mysql_query() in -lmysqlclient... no
checking for main() in -lnsl... yes
checking for mysql_query() in -lmysqlclient... no
checking for main() in -lmygcc... no
checking for mysql_query() in -lmysqlclient... no
*** extconf.rb failed ***
Could not create Makefile due to some reason, probably lack of
necessary libraries and/or headers.  Check the mkmf.log file for more
details.  You may need configuration options.

I am not good with server setup and things like this. I am an OS X user, but didn’t have to deal with any of this on OS X. Can anyone point me in the right direction?

Answer 1

Look in the Gemfile and see if there is a line that looks like either of the following.

gem "mysql2"
gem "mysql2", 0.2.6

If there are, comment out or delete these lines, remove Gemfile.lock and run bundle install again.