# Gem Commands with Nokogiri

**URL:** <https://www.ruby-forum.com/t/gem-commands-with-nokogiri/197479>\
**Category:** Ruby\
**Created:** [October 15, 2010, 2:13am UTC](https://www.ruby-forum.com/t/gem-commands-with-nokogiri/197479 "2010-10-15T02:13:28Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![Dobai-Pataky\_BSSSSl](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/d/77aa72/32.png) [@Dobai-Pataky\_BSSSSl](https://www.ruby-forum.com/u/Dobai-Pataky_BSSSSl)\
**Post date:** [October 15, 2010, 2:13am UTC](https://www.ruby-forum.com/t/gem-commands-with-nokogiri/197479/1 "2010-10-15T02:13:28Z")

</div>

I am on windows XP.

trying to install nokogiri. I have the devkit installed.

I received the error below. So I am trying to use the commands based  
on its output but they are erroring for me as well.

PS C:\devkit\> gem install nokogiri --with-xml2-lib --with-xslt-lib –  
platform=ruby  
ERROR: While executing gem … (OptionParser::InvalidOption)  
invalid option: --with-xml2-lib  
PS C:\devkit\> gem install nokogiri --with-xml2-include --with-xslt-  
include --platform=ruby  
ERROR: While executing gem … (OptionParser::InvalidOption)  
invalid option: --with-xml2-include  
PS C:\devkit\> gem install xml2 --platform=ruby  
ERROR: Could not find a valid gem ‘xml2’ (\>= 0) in any repository  
PS C:\devkit\> gem install nokogiri --with-libxml2-include --with-  
libxslt-include --platform=ruby  
ERROR: While executing gem … (OptionParser::InvalidOption)  
invalid option: --with-libxml2-include  
PS C:\devkit\>

PS C:\devkit\> gem install rake nokogiri rails --platform=ruby  
Temporarily enhancing PATH to include DevKit…  
Successfully installed rake-0.8.7  
Building native extensions. This could take a while…  
ERROR: Error installing nokogiri:  
ERROR: Failed to build gem native extension.

## C:/Ruby191/bin/ruby.exe extconf.rb checking for libxml/parser.h… no

## libxml2 is missing. please visit [Installing Nokogiri - Nokogiri](http://nokogiri.org/tutorials/installing_nokogiri.html) for help with installing depend encies.

\*\*\* extconf.rb failed \*\*\*  
Could not create Makefile due to some reason, probably lack of  
necessary libraries and/or headers. Check the mkmf.log file for more  
details. You may need configuration options.

Provided configuration options:  
–with-opt-dir  
–without-opt-dir  
–with-opt-include  
–without-opt-include=${opt-dir}/include  
–with-opt-lib  
–without-opt-lib=${opt-dir}/lib  
–with-make-prog  
–without-make-prog  
–srcdir=.  
–curdir  
–ruby=C:/Ruby191/bin/ruby  
–with-zlib-dir  
–without-zlib-dir  
–with-zlib-include  
–without-zlib-include=${zlib-dir}/include  
–with-zlib-lib  
–without-zlib-lib=${zlib-dir}/lib  
–with-iconv-dir  
–without-iconv-dir  
–with-iconv-include  
–without-iconv-include=${iconv-dir}/include  
–with-iconv-lib  
–without-iconv-lib=${iconv-dir}/lib  
–with-xml2-dir  
–without-xml2-dir  
–with-xml2-include  
–without-xml2-include=${xml2-dir}/include  
–with-xml2-lib  
–without-xml2-lib=${xml2-dir}/lib  
–with-xslt-dir  
–without-xslt-dir  
–with-xslt-include  
–without-xslt-include=${xslt-dir}/include  
–with-xslt-lib  
–without-xslt-lib=${xslt-dir}/lib  
–with-libxslt-config  
–without-libxslt-config  
–with-pkg-config  
–without-pkg-config

Gem files will remain installed in C:/Ruby191/lib/ruby/gems/1.9.1/gems/  
nokogiri-1.4.3.1 for inspection.  
Results logged to C:/Ruby191/lib/ruby/gems/1.9.1/gems/nokogiri-1.4.3.1/  
ext/nokogiri/gem\_make.out

---

<div class="post-metadata">

**Author:** ![flebber](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/f/f9ae1b/32.png) [@flebber](https://www.ruby-forum.com/u/flebber)\
**Post date:** [October 15, 2010, 2:30am UTC](https://www.ruby-forum.com/t/gem-commands-with-nokogiri/197479/2 "2010-10-15T02:30:55Z")

</div>

On Oct 14, 9:08pm, flebber [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote:

> I am on windows XP.
> 
> trying to install nokogiri. I have the devkit installed.
> 
> I received the error below. So I am trying to use the commands based  
> on its output but they are erroring for me as well.

Nokogiri already provides binaries for RubyInstaller precisely to  
avoid the compilation problems.

[https://rubygems.org/gems/nokogiri](https://rubygems.org/gems/nokogiri)

> PS C:\devkit\> gem install nokogiri --with-xml2-lib --with-xslt-lib –  
> platform=ruby  
> ERROR: While executing gem … (OptionParser::InvalidOption)  
> invalid option: --with-xml2-lib  
> PS C:\devkit\> gem install nokogiri --with-xml2-include --with-xslt-  
> include --platform=ruby  
> ERROR: While executing gem … (OptionParser::InvalidOption)  
> invalid option: --with-xml2-include  
> PS C:\devkit\> gem install xml2 --platform=ruby

If you want to supply options to the gem compilation process, you to  
do that after --:

gem install foo – --with-my-lib

Also note that you need libxml2 headers and libraries to compile  
against.

On a second comment, seems you’re using PowerShell. Batch files that  
modify the PATH might not work as expected inside PowerShell.

> libxml2 is missing. please  
> visithttp://nokogiri.org/tutorials/installing\_nokogiri.html  
> for help with installing depend  
> encies.

If you check the installation instructions for Windows, it has already  
provided a binary for it so you don’t need to compile it.