<note important>
The article currently is obsolete. I think pacman is better (but requires >= win6.0) https://msys2.github.io/.
<code bash | MSYS installation steps>
pacman -Syu
pacman -Su

# 64-bit
pacman -S mingw-w64-x86_64-toolchain
pacman -S mingw-w64-x86_64-glib2
pacman -S mingw-w64-x86_64-gtk3
pacman -S mingw-w64-x86_64-vala
pacman -S mingw-w64-x86_64-libgee
pacman -S mingw-w64-x86_64-perl
pacman -S make mingw-w64-x86_64-cmake

# 32-bit
pacman -S mingw-w64-i686-toolchain
pacman -S mingw-w64-i686-glib2
pacman -S mingw-w64-i686-gtk3
pacman -S mingw-w64-i686-vala
pacman -S mingw-w64-i686-libgee
pacman -S make mingw-w64-i686-cmake
pacman -S mingw-w64-i686-perl

# examples
valac -C --pkg gtk+-3.0 hello.vala
gcc `pkg-config --cflags gtk+-3.0` hello.c `pkg-config --libs gtk+-3.0`
</code>

Create shortcuts **c:\msys64\msys2_shell.cmd -mingw64** for 64bit environment,
**c:\msys64\msys2_shell.cmd -mingw32** for 32bit environment under 64bit system
and **c:\msys32\msys2_shell.cmd -mingw32** for 32bit environment under 32bit system only.

</note>

I've just found [[http://www.0x00.to/post/2013/12/14/Compile-and-run-Vala-on-Windows-using-MinGW-builds|Nice Manual Page]] how to install latest MinGW/GTK+3.0/Vala-git instruments under windows.

I'll make a copy-paste of the page to prevent deletion.

  - Download MinGW-w64 from [[http://sourceforge.net/projects/mingw-w64/|http://sourceforge.net/projects/mingw-w64/]].
  - Run "mingw-w64-install.exe", select "x32" or "i686" as Architecture, "win32" as Threads and "sjlj" as Exception: {{ :develop:win32:image.axd.png?direct |}}
  - Continue installation, I placed my to "C:\mingw-w64".
  - Download the latest "external-binary-packages" from [[http://sourceforge.net/projects/mingwbuilds/files/external-binary-packages/|http://sourceforge.net/projects/mingwbuilds/files/external-binary-packages/]] and copy the "msys" directory to "C:\mingw-w64\mingw32".
  - Open "‪C:\mingw-w64\mingw32\msys\etc\fstab" with Notepad++ and add the line "C:\mingw-w64\mingw32 /mingw".
  - Download the Win32 GTK+ "all-in-one bundle" from [[http://win32builder.gnome.org/|http://win32builder.gnome.org/]] and extract it's content to "C:\mingw-w64\mingw32".
  - Create a new shortcut, e.g. on the Desktop and set the location to "C:\mingw-w64\mingw32\msys\bin\mintty.exe /bin/bash -l" in order to get a nice shell.
  - Download the latest source tarball from [[https://wiki.gnome.org/Projects/Vala/Release|https://wiki.gnome.org/Projects/Vala/Release]] and extract it to "C:\mingw-w64\mingw32\msys\home\{Your Username}".
  - Run the Mintty shortcut you created in step 7 and switch with "cd" to the vala source directory.
  - Run "ln -s /mingw/bin/gcc /mingw/bin/cc" since valac requires cc command instead of gcc;
  - Run "rm $SYSTEMROOT/system32/zlib1.dll because of it is incompatible with the toolchain;
  - Now you should be able to run the fallowing three commands without any issues: <code bash | Building and installing Vala>./configure --prefix=/mingw --host=i686-w64-mingw32
make
make install</code>
  - Run "valac" to see if it works: <code bash | Test Vala>$ valac --version
Vala 0.22.1</code>
  - Go to "Control Panel\System and Security\System" -> "Advanced system settings" ->  "Environment Variables" and add this to your "Path" system variable: <code=plain | $PATH>C:\mingw-w64\mingw32\bin</code>
  - Create somewhere a file called "hello.vala" and paste in this: <code vala | Hello world!>using Gtk;
 
int main (string[] args) {
    Gtk.init (ref args);
 
    var window = new Window ();
    window.title = "First GTK+ Program";
    window.border_width = 10;
    window.window_position = WindowPosition.CENTER;
    window.set_default_size (350, 70);
    window.destroy.connect (Gtk.main_quit);
 
    var button = new Button.with_label ("Click me!");
    button.clicked.connect (() => {
        button.label = "Thank you";
    });
 
    window.add (button);
    window.show_all ();
 
    Gtk.main ();
    return 0;
}</code>
  - Open a normal Windows CMD, cd to the location of the file and run "valac --pkg gtk+-3.0 -X -mwindows hello.vala"
  - Execute the compiled "hello.exe", you should see your first Vala GTK+ window, congratulation {{:develop:win32:smiley-cool.gif?direct|}}: {{ :develop:win32:image-2.axd.png?direct |}}

A lot of thanks to [[http://www.0x00.to/author/Hendrik|Hendrik]]! :)