Ruby gem安装pg不'；不要在OSX Lion上工作
这个问题有各种各样的说法，但似乎没有一个能解决我的问题 我正在运行OSX Lion（10.7.3）。已安装最新的XCode 我使用postgresap.com上的Postgres.app包安装了Postgres 但当我尝试安装pg gem时，我失败了：Ruby gem安装pg不'；不要在OSX Lion上工作,ruby,postgresql,rubygems,osx-lion,pg,Ruby,Postgresql,Rubygems,Osx Lion,Pg,这个问题有各种各样的说法，但似乎没有一个能解决我的问题 我正在运行OSX Lion（10.7.3）。已安装最新的XCode 我使用postgresap.com上的Postgres.app包安装了Postgres 但当我尝试安装pg gem时，我失败了： $ gem install pg -- --with-pg-config=/Applications/Postgres.app/Contents/MacOS/bin/pg_config Building native extensions. T
$ gem install pg -- --with-pg-config=/Applications/Postgres.app/Contents/MacOS/bin/pg_config
Building native extensions. This could take a while...
ERROR: Error installing pg:
ERROR: Failed to build gem native extension.
/Users/disaacs/.rvm/rubies/ruby-1.9.3-p125/bin/ruby extconf.rb --with-pg-config=/Applications/Postgres.app/Contents/MacOS/bin/pg_config
Using config values from /Applications/Postgres.app/Contents/MacOS/bin/pg_config
checking for libpq-fe.h... *** 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
--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=/Users/disaacs/.rvm/rubies/ruby-1.9.3-p125/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
/Users/disaacs/.rvm/rubies/ruby-1.9.3-p125/lib/ruby/1.9.1/mkmf.rb:381:in `try_do': The compiler failed to generate an executable file. (RuntimeError)
You have to install development tools first.
from /Users/disaacs/.rvm/rubies/ruby-1.9.3-p125/lib/ruby/1.9.1/mkmf.rb:506:in `try_cpp'
from /Users/disaacs/.rvm/rubies/ruby-1.9.3-p125/lib/ruby/1.9.1/mkmf.rb:970:in `block in find_header'
from /Users/disaacs/.rvm/rubies/ruby-1.9.3-p125/lib/ruby/1.9.1/mkmf.rb:790:in `block in checking_for'
from /Users/disaacs/.rvm/rubies/ruby-1.9.3-p125/lib/ruby/1.9.1/mkmf.rb:284:in `block (2 levels) in postpone'
from /Users/disaacs/.rvm/rubies/ruby-1.9.3-p125/lib/ruby/1.9.1/mkmf.rb:254:in `open'
from /Users/disaacs/.rvm/rubies/ruby-1.9.3-p125/lib/ruby/1.9.1/mkmf.rb:284:in `block in postpone'
from /Users/disaacs/.rvm/rubies/ruby-1.9.3-p125/lib/ruby/1.9.1/mkmf.rb:254:in `open'
from /Users/disaacs/.rvm/rubies/ruby-1.9.3-p125/lib/ruby/1.9.1/mkmf.rb:280:in `postpone'
from /Users/disaacs/.rvm/rubies/ruby-1.9.3-p125/lib/ruby/1.9.1/mkmf.rb:789:in `checking_for'
from /Users/disaacs/.rvm/rubies/ruby-1.9.3-p125/lib/ruby/1.9.1/mkmf.rb:969:in `find_header'
from extconf.rb:40:in `<main>'
Gem files will remain installed in /Users/disaacs/.rvm/gems/ruby-1.9.3-p125/gems/pg-0.13.2 for inspection.
Results logged to /Users/disaacs/.rvm/gems/ruby-1.9.3-p125/gems/pg-0.13.2/ext/gem_make.out
"/usr/bin/gcc-4.2 -o conftest -I/Users/disaacs/.rvm/rubies/ruby-1.9.3-p125/include/ruby-1.9.1/x86_64-darwin10.8.0 -I/Users/disaacs/.rvm/rubies/ruby-1.9.3-p125/include/ruby-1.9.1/ruby/backward -I/Users/disaacs/.rvm/rubies/ruby-1.9.3-p125/include/ruby-1.9.1 -I. -I/Users/disaacs/.rvm/usr/include -D_XOPEN_SOURCE -D_DARWIN_C_SOURCE -I/Applications/Postgres.app/Contents/MacOS/include -O3 -ggdb -Wextra -Wno-unused-parameter -Wno-parentheses -Wno-long-long -Wno-missing-field-initializers -Wpointer-arith -Wwrite-strings -Wdeclaration-after-statement -Wshorten-64-to-32 -Wimplicit-function-declaration -fno-common -pipe conftest.c -L. -L/Users/disaacs/.rvm/rubies/ruby-1.9.3-p125/lib -L/Users/disaacs/.rvm/usr/lib -L. -L/usr/local/lib -L/Applications/Postgres.app/Contents/MacOS/lib -lruby.1.9.1 -lpthread -ldl -lobjc "
checked program was:
/* begin */
1: #include "ruby.h"
2:
3: int main() {return 0;}
/* end */
find_header ('libpq-fe.h')
find_header$ irb
1.9.3-p125 :001 > require 'mkmf'
=> true
1.9.3-p125 :002 > find_header 'libpq-fe.h'
checking for libpq-fe.h... RuntimeError: The compiler failed to generate an executable file.
You have to install development tools first.
checking for sqlite3.h... *** extconf.rb failed ***
我以前从未遇到过sqlite3 gem的问题。如果输出包括：
/Users/disaacs/.rvm/rubies/ruby-1.9.3-p125/lib/ruby/1.9.1/mkmf.rb:381:in `try_do': \
The compiler failed to generate an executable file. (RuntimeError)
You have to install development tools first.
extconf.rb如果您安装了XCode，那么您可能没有安装XCode的命令行工具组件？它们是，所以您需要单独安装。我也有类似的问题。根据bobfet1对a的回答，我能够通过以下方式安装gem：
sudo env ARCHFLAGS="-arch x86_64" gem install pg -- --with-pg-config=/Applications/Postgres.app/Contents/MacOS/bin/pg_config
我也遇到了这个问题，对我来说，答案是更新所有事物的RVM
rvm get head
rvm install 1.9.2
我终于找到了问题的原因！虽然我仍然不确定这个问题是如何产生的 查看install命令失败时创建的mkmf.log文件的内容（请参阅我的原始文章）。它记录运行以下命令的尝试
/usr/bin/gcc-4.2 ...and so on...
/usr/bin/gcc-4.2gccllvm-gcc-4.2sudo ln -s llvm-gcc-4.2 gcc-4.2
gem install pg我在《冰冻的加努克》的博文中找到了这个问题的解决方案。他推测这个问题可能是由XCode版本冲突引起的。无论什么原因，我永远的感谢 从应用商店安装xcode是不够的。您还需要xcode的命令行工具。 从应用商店安装xcode后，打开xcode。 转到Xcode->打开开发工具->更多开发工具 下载并安装最新的命令行工具 打开终端窗口并运行：
sudo gem install pg我在山狮上，戴夫·艾萨克斯（Dave Isaacs）接受的答案对我很有用。我也不得不这样做
sudo ln -s llvm-g++-4.2 g++-4.2
我也是在山狮上，除了@grilix建议的“sudo ln-s/usr/bin/{llvm-，}gcc-4.2”之外，我还需要做：
sudo ln -s /usr/bin/{llvm-,}g++-4.2
没有像上面那样更新RVM本身（），而是重新安装了Ruby 2.0.0-p247，在尝试了上面的所有其他步骤后没有成功
rvm get head
rvm install 2.0.0
sudo ln -s /usr/bin/llvm-gcc /usr/bin/gcc-4.2
在Mavericks 10.9上也存在类似的问题，但这是由于没有同意Xcode许可协议造成的。哎哟 运行
sudoxcodebuild在Mavericks上使用：
xcode选择--installrvm uninstall 1.9.2-p320
$ gem install pg
$ sudo gem install pg
$ sudo find / -name “pg_config”
$ sudo gem install pg
$ sudo find / -name “pg_config”
pg_config$ sudo gem install pg --with-pg-config=/usr/local/Cellar/postgresql/9.5.1/bin/pg_config
pg\u configgem list更多信息可以在中找到。该链接中问题的解决方案是安装最新的XCode。我已经安装了最新的XCode。您是否尝试过使用自制软件安装pq？同样值得尝试的是，看看
libpqlibpq devpg--gem help install--rm---r-rsudo-ln-s/usr/bin/{llvm-，}gcc-4.2