Rails on windows - install issue - ruby-on-rails

Question

I'm trying to install ruby on a Windows box and am having an issue. I have gotten up to this point when I start getting errors, and I'm completely new to anything other than PHP for web development. Help appreciated!
EDIT I'm following the instructions here for wamp:
http://www.alexbernard.fr/fichiers/blog/Installer-Ruby-On-Rails-sur-un-Wamp-Server.pdf
./gem install rails --include-dependencies
Output:
INFO: `gem install -y` is now default and will be removed
INFO: use --ignore-dependencies to install only the gems you list
Temporarily enhancing PATH to include DevKit...
Building native extensions. This could take a while...
ERROR: Error installing rails:
ERROR: Failed to build gem native extension.
C:/wamp/ruby/bin/ruby.exe extconf.rb
creating Makefile
make
generating generator-x64-mingw32.def
compiling generator.c
make: x86_64-w64-mingw32-gcc: Command not found
make: *** [generator.o] Error 127
Gem files will remain installed in C:/wamp/ruby/lib/ruby/gems/2.0.0/gems/json-1.8.0 for inspection.
Results logged to C:/wamp/ruby/lib/ruby/gems/2.0.0/gems/json-1.8.0/ext/json/ext/generator/gem_make.out

Answer 1

From the output shown above, I assume the following:
Installed Ruby 2.0.0 x64 (64bits)
Installed some DevKit from RubyInstaller page
Now, as explained here, for 64bits Ruby you need 64bits DevKit.
From the error in the output:
make: x86_64-w64-mingw32-gcc: Command not found
It is clear you didn't install the right DevKit.
Please remove the DevKit installed, download the correct one (as indicated in the link above and in RubyInstaller downloads page) and install again.
You will require to use ruby dk.rb install --force (note the --force option) to override the previous DevKit installation.
As for the the deprecation error, --include-dependencies is no longer required. I recommend you use as installation reference a modern Ruby/Rails guide.

Answer 2

You can go the RailsInstaller way to install Rails and all dependencies in one go without getting into such problems.

Answer 3

For me, the problem was that the DevKit binaries did not get added to the PATH. Make sure that (DEVKIT_FOLDER)\mingw\bin is on the path.

Answer 4

Because I read this answer with hope of fixing my problem, and found it did not help, here's how I resolved it:
--
Your error is:
make: x86_64-w64-mingw32-gcc: Command not found
--
The error means that you don't have access to the gcc/gc++ compiler on your PC.
You should therefore either locate, or download a version of the compiler to your system. I found installing the build tools located here solved the issue.
You just have to download those tools, then add them to the PATH var: set PATH=C:/path/to/your/ming64/location/;%PATH%;
This should build it for you.
A caveat -- whether you have the correct dependencies for a build to take place is another question entirely.

Answer 5

The exe is in rubydevkit\mingw\bin. Just add that to your path and json will build.