我使用的是 Ubuntu 12.10 64 位，并且安装了以下软件包：
dpkg --get-selections | grep postgre
output:
postgresql
postgresql-9.1
postgresql-client
postgresql-client-9.1
postgresql-client-common
postgresql-common
postgresql-contrib
postgresql-contrib-9.1
postgresql-server-dev-9.1
postgresql-server-dev-all
libpq-dev
libpq5
rvm 1.17.9
ruby 1.9.3p362 (2012-12-25 revision 38607) [x86_64-linux]
我无法安装 pg gem 我收到以下错误：
ERROR: Error installing pg:
ERROR: Failed to build gem native extension.
/home/vedarthk/.rvm/rubies/ruby-1.9.3-p362/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)
我也尝试过以下命令，但输出与上面相同：
gem install pg -- --with-pg-include=/usr/include/postgresql/libpq --with-pg-lib=/usr/lib/postgresql/9.1/lib
gem install pg -- --with-pg-include=/usr/include/postgresql --with-pg-lib=/usr/lib/postgresql/9.1/lib
尝试安装 PostgreSQL 开发头文件：
sudo apt-get install libpq-dev
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