我使用的是Ruby on Rails 3.1预版本。我喜欢使用PostgreSQL,但问题是安装pg gem。它给了我以下错误:

$ gem install pg
Building native extensions.  This could take a while...
ERROR:  Error installing pg:
    ERROR: Failed to build gem native extension.

        /home/u/.rvm/rubies/ruby-1.9.2-p0/bin/ruby 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 ***
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/u/.rvm/rubies/ruby-1.9.2-p0/bin/ruby
    --with-pg
    --without-pg
    --with-pg-dir
    --without-pg-dir
    --with-pg-include
    --without-pg-include=${pg-dir}/include
    --with-pg-lib
    --without-pg-lib=${pg-dir}/lib
    --with-pg-config
    --without-pg-config
    --with-pg_config
    --without-pg_config
    Gem files will remain installed in /home/u/.rvm/gems/ruby-1.9.2-p0/gems/pg-0.11.0 for inspection.
    Results logged to /home/u/.rvm/gems/ruby-1.9.2-p0/gems/pg-0.11.0/ext/gem_make.out

我怎么解决这个问题?


当前回答

只是缺少libpq-fe.h的问题

在ubuntu上,我们只需要运行: Sudo apt-get安装libpq-dev

上面的命令将安装一个新的包libpq-dev,之后你可以再次执行bundle install来继续你的包安装。

其他回答

对于AltLinux,是postgresqlx包。X-devel(在我的例子中是postgresql9.5-devel)必须安装:

apt-get install postgresql9.5-devel

找不到libpq-fe.h头文件

我在CentOS 7.0.1406上运行以下命令成功:

~ % psql --version # => psql (PostgreSQL) 9.4.1
yum install libpqxx-devel
gem install pg -- --with-pg-config=/usr/pgsql-9.4/bin/pg_config

或者,你可以配置捆绑器总是安装pg,使用这些选项(有助于在部署环境中运行捆绑器),

包配置构建。pg - with-pg-config = / usr / bin / pg_config / pgsql - 9.4

我在使用Postgresql 9.6时遇到了这个问题。我可以通过这样做来修复它:

brew upgrade postgresql@9.6
brew link postgresql@9.6 --force
gem install pg

我在通过asdf安装postgres时遇到了同样的错误。pg-config解决方案对我不起作用。相反,我必须找到包含该文件的postgres include文件夹,并运行带有——with-pg-include标志的命令

gem install pg -- --with-pg-include=/<path>/.asdf/installs/postgres/<version>/include

对于Mac OS X,只需安装https://postgresapp.com/,并遵循命令行部分和ruby的步骤

sudo mkdir -p /etc/paths.d &&
echo /Applications/Postgres.app/Contents/Versions/latest/bin | sudo tee /etc/paths.d/postgresapp

然后

sudo ARCHFLAGS="-arch x86_64" gem install pg