我很难用Vagrant设置虚拟机。
每当我使用vagrant＆gt; provision时，Chef都会失败：
[2014-03-15T19：16：08 + 00:00]错误：chef_gem [pg]（postgresql :: ruby line 39）出错：Gem :: Installer :: ExtensionBuildError：错误：无法构建gem原生扩展。
> /opt/chef/embedded/bin/ruby extconf.rb checking for pg_config... yes
> Using config values from /usr/bin/pg_config checking for libpq-fe.h... yes
> checking for libpq/libpq-fs.h... yes
> checking for pg_config_manual.h... yes checking for PQconnectdb() in -lpq... no
> checking for PQconnectdb() in -llibpq... no
> checking for PQconnectdb() in -lms/libpq... no
> Can't find the PostgreSQL client library (libpq)
> *** 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.
我很难理解这里要做什么。我在VM上手动安装了postgres，从cheffile中移除了postgres但仍然没有Chef失败。
任何帮助表示感谢。