Cannot install Puma gem on Ruby on Rails - ruby-on-rails

Question

I'm trying to install the puma gem, but when I run
gem install puma
I get this error message:
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:/Ruby193/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 unsigned 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:/Ruby193/include/ruby-1.9.1/ruby/intern.h:653:7: note: expected 'const char *' but argument is of type 'uint8_t *'
compiling mini_ssl.c
In file included from mini_ssl.c:3:0:
c:/Ruby193/include/ruby-1.9.1/ruby/backward/rubyio.h:2:2: warning: #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:/Ruby193/lib/ruby/gems/1.9.1/gems/puma-2.6.0 for inspection.
Results logged to C:/Ruby193/lib/ruby/gems/1.9.1/gems/puma-2.6.0/ext/puma_http11/gem_make.out
Adding gem 'puma' to my Gemfile and running bundle install isn't an option, because that just doesn't work with any gem and gives me an error message (which is a separate issue, one that I've circumvented with the other gems I've used by installing them via gem install).

Answer 1

Came across very same issue.
sudo apt-get install libssl-dev
fixed it for me.

Answer 2

I ran bundle update before bundle install and that solved the issue for me.
I'm not sure if that was the only thing that helped, as I manually updated puma before that, using these steps:
Checked which version of openssl Ruby is using by running ruby -v -ropenssl -e "puts OpenSSL::OPENSSL_VERSION"
Downloaded the right openssl version from
http://packages.openknapsack.org/openssl/openssl-1.0.0o-x86-windows.tar.lzma
(got the link from https://github.com/hicknhack-software/rails-disco/wiki/Installing-puma-on-windows and edited it based on the output of #1).
Extracted openssl using http://www.7-zip.org to C:\RailsInstaller\openssl
gem install puma -- --with-opt-dir=C:/RailsInstaller/openssl

Answer 3

Figured out the solution to the puma bundle. Followed directions from https://github.com/hicknhack-software/rails-disco/wiki/Installing-puma-on-windows
First you need to download:
DevKit compatible with your ruby version
OpenSSL Developer Package (contains header files and binaries)
And then:
Install DevKit, e.g. in c:\devkit
Unpack the OpenSSL Package, e.g. in c:\openssl (use 7Zip or PeaZip)
You need to copy the ddls from the bin directory (libeay32.dll and ssleay32.dll) to your ruby/bin directory.
Open a windows console
Initialize the DevKit build environment: c:\devkit\devkitvars.bat (except here, I used this in command prompt instead: ruby dk.rb init)
Now it’s possible to install the puma gem with the OpenSSL packages:
gem install puma -- --with-opt-dir=c:\openssl

Answer 4

I think you hit issue #430
https://github.com/puma/puma/issues/430
Re-installing Ruby might help you as well as it closed this issue on GitHub.