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

对于任何基于debian的发行版(包括Ubuntu),一个更通用的答案如下。首先,以root身份安装apt-file包:

apt-get install apt-file

这允许您搜索包含文件的包。然后,更新其数据库使用

apt-file update

(这可以作为普通用户运行)。然后,使用以下方法查找丢失的头文件:

apt-file search libpq-fe.h

在我的机器上,这给出:

libpq-dev: /usr/include/postgresql/libpq-fe.h
postgres-xc-server-dev: /usr/include/postgres-xc/server/gtm/libpq-fe.h

好了!

其他回答

我通过安装postgresql-common包解决了这个问题。这个包提供了pg_config二进制文件,这很可能是您所缺少的。

我通过rvm重新安装Ruby修复了同样的错误:

rvm reinstall 1.9.3

Ubuntu 20.04.1 LTS,这似乎对我有用:

sudo apt-get install ruby ruby-dev libpqxx-dev libpq-fe-dev libpq-dev 
sudo gem install pg -- --with-pg-config=/usr/include/postgresql/pg_config --with-pg-include=/usr/include/postgresql/

在MacOS M1上解决:

brew install libpq

然后我输入我的路径

echo 'export PATH="/opt/homebrew/opt/libpq/bin:$PATH"' >> ~/.zshrc

And:

gem install pg

郑重声明:

Ruby on Rails 4应用程序在OS X与PostgresApp(在这种情况下需要0.17.1版本-有点老项目):

gem install pg -v '0.17.1' -- --with-pg-config=/Applications/Postgres.app/Contents/Versions/9.3/bin/pg_config