我在Asus Chromebook上通过crouton安装了Ubuntu 12.04 Precise。我有一个需要postgres的rails应用程序。当我运行“bundle”时，它无法安装pg gem。我尝试独立安装多个版本，但都失败了。以下是失败报告：
Building native extensions. This could take a while... ERROR: Error installing pg: ERROR: Failed to build gem native extension.
/home/oscar/.rvm/rubies/ruby-1.9.3-p551/bin/ruby -r ./siteconf20150331-16650-11xjo0a.rb extconf.rb checking forpg_config... yes Using config values from /usr/bin/pg_config You need to install postgresql-server-dev-X.Y for building a server-side extension or libpq-dev for building a client-side application. You need to install postgresql-server-dev-X.Y for building a server-side extension or libpq-dev for building a client-side application. checking for libpq-fe.h... no Can't find the 'libpq-fe.h header * extconf.rb failed * Could not create Makefile due to some reason, probably lack of necessary libraries and/or headers. Check the mkmf.log file for more details. You may need configuration options.
Provided configuration options: --with-opt-dir --without-opt-dir --with-opt-include --without-opt-include=${opt-dir}/include --with-opt-lib --without-opt-lib=${opt-dir}/lib --with-make-prog --without-make-prog --srcdir=. --curdir --ruby=/home/oscar/.rvm/rubies/ruby-1.9.3-p551/bin/ruby --with-pg --without-pg --enable-windows-cross --disable-windows-cross --with-pg-config --without-pg-config --with-pg_config --without-pg_config --with-pg-dir --without-pg-dir --with-pg-include --without-pg-include=${pg-dir}/include --with-pg-lib --without-pg-lib=${pg-dir}/lib
extconf failed, exit code 1
Gem files will remain installed in /home/oscar/.rvm/gems/ruby-1.9.3-p551/gems/pg-0.18.1 for inspection. Results logged to /home/oscar/.rvm/gems/ruby-1.9.3-p551/extensions/x86_64-linux/1.9.1/pg-0.18.1/gem_make.out
我也尝试使用brew安装它。文件已经下载并似乎已经安装，但当我运行“brew upgrade postgresql”时，它说postgresql不存在。我已经没有其他想法了，而且我还没有找到其他人有我的问题。