Начало работы с Ruby при установке пакета Heroku, puma 2.9.1

Я пытаюсь установить пакет Ruby на Heroku. Я следовал процедурам, описанным на странице «Начало работы с Ruby на Heroku». Когда я делаю bundle install, я получаю сообщение об ошибке, предлагающее мне установить puma v 2.9.1.

Gem::Installer::ExtensionBuildError: ERROR: Failed to build gem native extension
.

        c:/RailsInstaller/Ruby1.9.3/bin/ruby.exe extconf.rb
creating Makefile

make
generating puma_http11-i386-mingw32.def
compiling http11_parser.c
ext/http11/http11_parser.rl: In function 'puma_parser_execute':
ext/http11/http11_parser.rl:111:3: warning: comparison between signed and unsign
ed integer expressions
compiling io_buffer.c
io_buffer.c: In function 'buf_to_str':
io_buffer.c:119:3: warning: pointer targets in passing argument 1 of 'rb_str_new
' differ in signedness
c:/RailsInstaller/Ruby1.9.3/include/ruby-1.9.1/ruby/intern.h:661:7: note: expect
ed 'const char *' but argument is of type 'uint8_t *'
compiling mini_ssl.c
In file included from mini_ssl.c:3:0:
c:/RailsInstaller/Ruby1.9.3/include/ruby-1.9.1/ruby/backward/rubyio.h:2:2: warni
ng: #warning use "ruby/io.h" instead of "rubyio.h"
mini_ssl.c:4:25: fatal error: openssl/bio.h: No such file or directory
compilation terminated.
make: *** [mini_ssl.o] Error 1


Gem files will remain installed in c:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9
.1/gems/puma-2.9.1 for inspection.
Results logged to c:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/puma-2.9.
1/ext/puma_http11/gem_make.out
An error occurred while installing puma (2.9.1), and Bundler cannot continue.
Make sure that `gem install puma -v '2.9.1'` succeeds before bundling.

Когда я пытаюсь установить Puma, я получаю это:

$ gem install puma -v '2.9.1'
Temporarily enhancing PATH to include DevKit...
Building native extensions.  This could take a while...
ERROR:  Error installing puma:
        ERROR: Failed to build gem native extension.

        c:/RailsInstaller/Ruby1.9.3/bin/ruby.exe extconf.rb
creating Makefile

make
generating puma_http11-i386-mingw32.def
compiling http11_parser.c
ext/http11/http11_parser.rl: In function 'puma_parser_execute':
ext/http11/http11_parser.rl:111:3: warning: comparison between signed and unsign
ed integer expressions
compiling io_buffer.c
io_buffer.c: In function 'buf_to_str':
io_buffer.c:119:3: warning: pointer targets in passing argument 1 of 'rb_str_new
' differ in signedness
c:/RailsInstaller/Ruby1.9.3/include/ruby-1.9.1/ruby/intern.h:661:7: note: expect
ed 'const char *' but argument is of type 'uint8_t *'
compiling mini_ssl.c
In file included from mini_ssl.c:3:0:
c:/RailsInstaller/Ruby1.9.3/include/ruby-1.9.1/ruby/backward/rubyio.h:2:2: warni
ng: #warning use "ruby/io.h" instead of "rubyio.h"
mini_ssl.c:4:25: fatal error: openssl/bio.h: No such file or directory
compilation terminated.
make: *** [mini_ssl.o] Error 1


Gem files will remain installed in c:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9
.1/gems/puma-2.9.1 for inspection.
Results logged to c:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/puma-2.9.
1/ext/puma_http11/gem_make.out

Кто-нибудь может сделать что-нибудь из этого?