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

其他回答

我最近升级到Mac OS X v10.10 (Yosemite),在构建pg gem时遇到了困难。

报告的错误是典型的:

Using config values from /usr/local/bin/pg_config
checking for libpq-fe.h... *** extconf.rb failed ***

我的解决方案是卸载pg gem,然后捆绑更新pg,用最新的gem替换gem。我确实运行了brew update;在Yosemite安装后进行brew升级,以获得我之前安装的软件包的最新版本。

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

在Mac OS X上运行如下:

gem install pg -- --with-pg-config=***/path/to/pg_config***

***/path/to/pg_config***是pg_config的路径

我在运行Postgres。应用程序,我必须这么做

export PATH=$PATH:/Applications/Postgres.app/Contents/Versions/9.4/bin

第一。然后

bundle install

为我工作。

在Ubuntu上,安装“libpq-dev”来解决这个问题。

sudo apt-get install libpq-dev