无法安装 gem pg - 找不到 PostgreSQL 客户端库 (libpq)

Question

在ubuntu 14.04中，我无法安装pg gem，但是我也安装了libpg-dev。

sudo apt-get install libpq-dev

在这里，我可以看到其他人也有同样的问题。

gem install pg
Building native extensions.  This could take a while...
ERROR:  Error installing pg:
    ERROR: Failed to build gem native extension.
    /home/user/.rvm/rubies/ruby-1.9.3-p194/bin/ruby -r ./siteconf20141202-24533-1xrmav0.rb 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.
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/user/.rvm/rubies/ruby-1.9.3-p194/bin/ruby
    --with-pg
    --without-pg
    --with-pg-config
    --without-pg-config
    --with-pg_config
    --without-pg_config
    --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-pqlib
    --without-pqlib
    --with-libpqlib
    --without-libpqlib
    --with-ms/libpqlib
    --without-ms/libpqlib
extconf failed, exit code 1
Gem files will remain installed in /home/user/.rvm/gems/ruby-1.9.3-p194/gems/pg-0.17.1 for inspection.
Results logged to /home/user/.rvm/gems/ruby-1.9.3-p194/extensions/x86_64-linux/1.9.1/pg-0.17.1/gem_make.out

有什么帮助吗？

Answer 1

运行此代码sudo ARCHFLAGS="-arch x86_64" gem install pg -v '0.18.2'然后bundle install .它应该正确安装 pg gem。

Answer 2

你应该在线发布你的mkmf.log文件，但你还需要检查你的Ruby和PostgreSQL是否使用相同的OpenSSL版本。

您可能

已经通过RVM安装了Ruby和OpenSSL，并且PostgreSQL正在使用系统版本。这将导致冲突。

Answer 3

我的电脑上也有同样的问题。我只是运行rvm get stable来更新rvm，然后bundle install再运行一次.成功安装此 pg gem 后。

Answer 4

我想你已经正确安装了 Postgres。你试过这样通过拱旗吗？

env ARCHFLAGS="-arch x86_64" gem install pg