From: Alex Fenton <alex@...>
Date: 2009-02-20T08:34:45+09:00
Subject: Re: "You have to install development tools first." Windows

Alexandre Alex wrote:

> I'm having some trouble with mkmf.
> 
> I'm on Ruby 1.9.1, Windows
> 
> Each time I try to use have_library (pretty sure it's not the only
> method that doesn't work..), it raises errors:
> 
> C:/ruby191/lib/ruby/1.9.1/mkmf.rb:362:in `try_do': The complier failed
> to genera
> te an executable file. (RuntimeError)
> You have to install development tools first.

I'd guess this means that you have to install a C-compiler, 
specifically, the one that was used to compile your ruby.

Check the output of "ruby -v". If it looks like "mswin32" then 
Microsoft's C Compiler (MSVC) is what you need. If it looks like 
"mingw32" then MingW is what you need.

If you have some choice, then I'd see if a MingW build fits your needs. 
It's smaller and self-contained. There's numerous places you can go, but 
the wxRuby project is currently offering a ready-to-go Ruby-1.9 with 
compilation tools for other libraries:

http://rubyforge.org/frs/download.php/51354/wxruby-1.9.10-ruby-1.9.1-mingw32-setup.exe

alex