Shared mingw ruby devkit folder

C:\>tree -d -L 1 c:\ruby
c:\ruby
|-- 185-p012-mswin32
|-- 186-p287-mswin32
|-- 186-p368-mingw32
|-- 191-p000-mingw32
|-- 191-p191-mingw32
`-- devkit

6 directories

C:\>tree -d -L 2 c:\ruby
c:\ruby
|-- 185-p012-mswin32
|   |-- bin
|   |-- doc
|   |-- lib
|   |-- man
|   |-- samples
|   |-- share
|   `-- src
|-- 186-p287-mswin32
|   |-- bin
|   |-- doc
|   |-- lib
|   |-- man
|   |-- misc
|   |-- samples
|   |-- share
|   `-- src
|-- 186-p368-mingw32
|   |-- bin
|   |-- lib
|   `-- share
|-- 191-p000-mingw32
|   |-- bin
|   |-- include
|   |-- lib
|   `-- share
|-- 191-p191-mingw32
|   |-- bin
|   |-- include
|   |-- lib
|   `-- share
`-- devkit
    |-- gcc
    `-- msys

34 directories

C:\>cat c:\ruby\191-p000-mingw32\bin\make.bat
@ECHO OFF
SETLOCAL
IF "%DEVKIT%" == "" SET DEVKIT=%~dp0..\devkit
SET PATH=%DEVKIT%\gcc\3.4.5\bin;%DEVKIT%\msys\1.0.11\bin
bash.exe  --login -i -c "make %*"

C:\>set devkit
devkit=C:\ruby\devkit


C:\>pik run "make -v"

 == Running with 185: ruby 1.8.5 (2006-12-25 patchlevel 12) [i386-mswin32] ==
'make' is not recognized as an internal or external command,
operable program or batch file.

 == Running with 186: ruby 1.8.6 (2008-08-11 patchlevel 287) [i386-mswin32] ==
'make' is not recognized as an internal or external command,
operable program or batch file.

 == Running with 186: ruby 1.8.6 (2009-03-31 patchlevel 368) [i386-mingw32] ==
GNU Make 3.81
Copyright (C) 2006  Free Software Foundation, Inc.
This is free software; see the source for copying conditions.
There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A
PARTICULAR PURPOSE.

This program built for i686-pc-msys

 == Running with 191: ruby 1.9.1p0 (2009-01-30 revision 21907) [i386-mingw32] ==
GNU Make 3.81
Copyright (C) 2006  Free Software Foundation, Inc.
This is free software; see the source for copying conditions.
There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A
PARTICULAR PURPOSE.

This program built for i686-pc-msys

 == Running with 191: ruby 1.9.1p129 (2009-05-12 revision 23412) [i386-mingw32]
==
GNU Make 3.81
Copyright (C) 2006  Free Software Foundation, Inc.
This is free software; see the source for copying conditions.
There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A
PARTICULAR PURPOSE.

This program built for i686-pc-msys