On May 5, 11:41=A0pm, Pen Ttt <myocean... / yahoo.cn> wrote:
> today i have installed ubuntu10.04.
> pt@pt-laptop:~$ ruby -v
> ruby 1.8.7 (2010-01-10 patchlevel 249) [i486-linux]
> pt@pt-laptop:~$ gem -v
> 1.3.5
> pt@pt-laptop:~$ sudo gem install mysql
> Building native extensions. This could take a while...
> ERROR: Error installing mysql:
> ERROR: Failed to build gem native extension.
>
> /usr/bin/ruby1.8 extconf.rb
> extconf.rb:10:in `require': no such file to load -- mkmf (LoadError)
> from extconf.rb:10
>
> Gem files will remain installed in /var/lib/gems/1.8/gems/mysql-2.8.1
> for inspection.
> Results logged to
> /var/lib/gems/1.8/gems/mysql-2.8.1/ext/mysql_api/gem_make.out
>
> how to sovle the problem?
> --
> Posted viahttp://www.ruby-forum.com/.

I was getting the exact same error - I can get sudo gem install mysql
to load only after running sudo apt-get install ruby-dev  but then
rails app  reports wrong wrong gem version and asks me to 2.2.3 back
from 2.2.5 sudo gem install -v=3D2.2.3 rails run app and web brick
starts and displays default page go to generators scaffold works then
rake db migrate you should get a password error alter user name and
password for all environments and I am hoping that works