Issue #5492 has been updated by Jon Forums. I can't replicate with a plain vanilla mingw + msys via cmd.exe...very odd. C:\Users\Jon\Documents\RubyDev\ruby-git>git co ruby_1_9_3 Switched to branch 'ruby_1_9_3' C:\Users\Jon\Documents\RubyDev\ruby-git>\DevKit\devkitvars.bat Adding the DevKit to PATH... C:\Users\Jon\Documents\RubyDev\ruby-git>sh -c "autoconf" C:\Users\Jon\Documents\RubyDev\ruby-git>cd build C:\Users\Jon\Documents\RubyDev\ruby-git\build>sh -c "../configure --enable-shared --disable-install-doc --prefix=C:/Users/Jon/Downloads/temp/ruby193" C:\Users\Jon\Documents\RubyDev\ruby-git\build>make C:\Users\Jon\Documents\RubyDev\ruby-git\build>make install ./miniruby.exe -I../lib -I. -I.ext/common ../tool/rbinstall.rb --make="make" --dest-dir="" --extout=".ext" --mflags="" --make-flags="" --data-mode=0644 --prog-mode=0755 --installed-list .installed.list --mantype="man" ... C:\Users\Jon\Downloads\temp\ruby193>tree /f bin Folder PATH listing Volume serial number is 00000002 9601:587A C:\USERS\JON\DOWNLOADS\TEMP\RUBY193\BIN erb.bat gem.bat irb.bat msvcrt-ruby191.dll rake.bat rdoc.bat ri.bat ruby.exe rubyw.exe testrb.bat No subfolders exist C:\Users\Jon\Downloads\temp\ruby193>set PATH=bin;%PATH% C:\Users\Jon\Downloads\temp\ruby193>ruby --version ruby 1.9.3dev (2011-10-11 revision 33457) [i386-mingw32] C:\Users\Jon\Downloads\temp\ruby193>erb --version erb.rb [2.1.0 $] C:\Users\Jon\Downloads\temp\ruby193>gem --version C:/Users/Jon/Downloads/temp/ruby193/lib/ruby/1.9.1/yaml.rb:56:in `<top (required)>': It seems your ruby installation is missing psych (for YAML output). To eliminate this warning, please install libyaml and reinstall your ruby. 1.8.11 ---------------------------------------- Bug #5492: MinGW Installation with Ruby 1.9.3rc1 Broken http://redmine.ruby-lang.org/issues/5492 Author: Charlie Savage Status: Open Priority: High Assignee: Category: build Target version: 1.9.3 ruby -v: ruby 1.9.3dev (2011-10-11 revision 33457) This is a regression since at least the preview release, not sure about the rc1 release. Using MinGW to make and then make install Ruby on Windows 7 now creates the following bin directory: bin erb .bat gem .bat etc. Notice the file should be "erb.bat", not a "erb" sudirectory with a file called ".bat" in it. The same is true for: erb gem irb rake rdoc ri testrb This obviously breaks the installation...so marking it high priority. -- http://redmine.ruby-lang.org