问题
Having trouble installing the nokogiri gem under rvm ruby 1.9.1.
gem install nokogiri
I'm getting ...
/usr/include/libxml2... no
libxml2 is missing. try 'port install libxml2' or 'yum install libxml2-devel'
*** extconf.rb failed ***
but i checked:
sudo apt-get install libxml2
and i got:
Reading state information... Done
libxml2 is already the newest version.
is this a root thing perhaps? RVM runs everything in userspace.
回答1:
You might want to confirm that the version of libxml installed by apt is current. Nokogiri likes nice fresh versions of libxml, so I built my libxml install from source.
nokogiri -v will tell you what you're using.
回答2:
A simpler solution:
sudo apt-get install libxslt-dev libxml2-dev
回答3:
I ran into a similar problem using homebrew on Mac.
Here's the code that does the trick, a small extension of the Nokogiri installation instructions for homebrew. Basically, you need to include a directive to tell nokogiri to use the homebrew libxml dirs. Make sure you point to the correct version of libxml2 installed by homebrew, which for me was 2.7.8:
brew install libxml2
brew link libxml2 #this may be enough but didn't work for me with rvm
#explicitly tell nokogiri to use you homebrew libxml2 rather than system
gem install nokogiri -- --with-xml2-include=/usr/local/Cellar/libxml2/2.7.8/include/libxml2 --with-xml2-lib=/usr/local/Cellar/libxml2/2.7.8/lib --with-xslt-dir=/usr/local/Cellar/libxslt/1.1.26
来源：https://stackoverflow.com/questions/2425676/rvm-1-9-1-nokogiri