Rails安装mysql2 gem报错:Failed to build gem native extension.
Ruby gem 'pg' 报错:Gem::LoadError can't activate pg (~> 0.18), already activated pg-1.0.0. Make sure all dependencies are added to Gemfile.
安装compass时出现ERROR: Failed to build gem native extension...... -- mkmf (Load Error)解决办法
Rails安装mysql2 gem报错:Failed to build gem native extension.
Ruby gem 'pg' 报错:Gem::LoadError can't activate pg (~> 0.18), already activated pg-1.0.0. Make sure all dependencies are added to Gemfile.