no such file to load -- zlib uninitialized constant Gem::Commands::InstallCom

#gem install mysql

ERROR: Loading command: install (LoadError)

no such file to load -- zlib

ERROR: While executing gem ... (NameError)

uninitialized constant Gem::Commands::InstallCommand

解决办法是：

进入ruby源码文件夹

安装ruby自身提供的zlib包

#cd ext/zlib

#ruby ./extconf.rb

#make

#make install