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Docker构build无法在Sinatra项目中安装pg gem

我已经审查了所有的post与类似的错误安装Postgres的pggem。 我的问题是独特的：我可以通过Gemfile和bundle install成功地将Postgres添加到我的Sinatra Ruby项目中 – 但是在构buildDocker镜像时，安装pg失败，出现以下错误： ERROR: Error installing pg: ERROR: Failed to build gem native extension. current directory: /usr/local/bundle/gems/pg-0.19.0/ext /usr/local/bin/ruby -r ./siteconf20170113-7-ottv1k.rb extconf.rb checking for pg_config… no No pg_config… trying anyway. If building fails, please try again with –with-pg-config=/path/to/pg_config checking for libpq-fe.h… no Can't find the 'libpq-fe.h header *** extconf.rb failed *** 我已经尝试了类似的答案build议一切： Brew安装/卸载， […]