AmazonLinuxでAWS SDK for Rubyを使うときにnokogiri とかlibxml2とかでいつものようにハマる
Installing the aws-sdk gem on EC2 (using the Amazon Linux AMI) https://gist.github.com/trevorrowe/1870314
yum install -y gcc make libxml2 libxml2-devel libxslt libxslt-devel rubygems ruby-devel
gem install nokogiri -- --with-xml2-lib=/usr/local/lib --with-xml2-include=/usr/local/include/libxml2 --with-xslt-lib=/usr/local/lib --with-xslt-include=/usr/local/include
↑これのあとで↓これをやればOK
gem install nokogiri -- --use-system-libraries