Gem :: Installer :: ExtensionBuildError：错误：无法构建gem原生扩展
为了提供一些背景知识 – 我刚刚从GitHub下载了一个Git Repo，用于朋友应用程序，我试图从我的Mac（’rails s’）启动它。 但是，我遇到以下错误//请参阅下面的//运行’bundle install’时。 似乎’pg’（postgreSQL）gem有一些模糊的安装错误。 任何帮助，将不胜感激！
我试过这个命令无济于事：
$ gem install pg – –with-pg-config = / usr / bin / pg_config /
这是错误日志：
Installing pg (0.15.0) with native extensions Gem::Installer::ExtensionBuildError: ERROR: Failed to build gem native extension. /usr/local/rvm/rubies/ruby-1.9.3-p194/bin/ruby 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... yes checking for PQconnectionUsedPassword()... yes checking for PQisthreadsafe()... yes checking for PQprepare()... yes checking for PQexecParams()... yes checking for PQescapeString()... yes checking for PQescapeStringConn()... yes checking for PQescapeLiteral()... yes checking for PQescapeIdentifier()... yes checking for PQgetCancel()... yes checking for lo_create()... yes checking for pg_encoding_to_char()... yes checking for pg_char_to_encoding()... yes checking for PQsetClientEncoding()... yes checking for PQlibVersion()... yes checking for PQping()... yes checking for PQsetSingleRowMode()... no checking for rb_encdb_alias()... yes checking for rb_enc_alias()... no checking for rb_thread_call_without_gvl()... yes checking for rb_thread_call_with_gvl()... yes checking for rb_thread_fd_select()... yes checking for rb_w32_wrap_io_handle()... no checking for PGRES_COPY_BOTH in libpq-fe.h... no checking for PGRES_SINGLE_TUPLE in libpq-fe.h... no checking for struct pgNotify.extra in libpq-fe.h... yes checking for unistd.h... yes checking for ruby/st.h... yes creating extconf.h creating Makefile make compiling gvl_wrappers.c compiling pg.c pg.c: In function 'Init_pg_ext': pg.c:384: error: 'PQPING_OK' undeclared (first use in this function) pg.c:384: error: (Each undeclared identifier is reported only once pg.c:384: error: for each function it appears in.) pg.c:386: error: 'PQPING_REJECT' undeclared (first use in this function) pg.c:388: error: 'PQPING_NO_RESPONSE' undeclared (first use in this function) pg.c:390: error: 'PQPING_NO_ATTEMPT' undeclared (first use in this function) make: *** [pg.o] Error 1 Gem files will remain installed in /usr/local/rvm/gems/ruby-1.9.3-p194/gems/pg-0.15.0 for inspection. Results logged to /usr/local/rvm/gems/ruby-1.9.3-p194/gems/pg-0.15.0/ext/gem_make.out An error occured while installing pg (0.15.0), and Bundler cannot continue. Make sure that `gem install pg -v '0.15.0'` succeeds before bundling. 的Gemfile
source 'https://rubygems.org' gem 'rails', '3.2.11' # Bundle edge Rails instead: # gem 'rails', :git => 'git://github.com/rails/rails.git' gem 'pg' gem 'json' # Gems used only for assets and not required # in production environments by default. group :assets do gem 'sass-rails', '~> 3.2.3' gem 'coffee-rails', '~> 3.2.1' # See https://github.com/sstephenson/execjs#readme for more supported runtimes # gem 'therubyracer', :platforms => :ruby gem 'uglifier', '>= 1.0.3' end gem 'jquery-rails' gem 'devise' gem 'rails-backbone' gem 'nokogiri' # To use ActiveModel has_secure_password # gem 'bcrypt-ruby', '~> 3.0.0' # To use Jbuilder templates for JSON # gem 'jbuilder' # Use unicorn as the app server # gem 'unicorn' # Deploy with Capistrano # gem 'capistrano' # To use debugger # gem 'ruby-debug'
看起来你没有安装postgresql。 尝试使用postgres应用程序，因为您使用的是mac。
在Debian系统上，您必须安装libpq-dev软件包才能在远程服务器上使用postgres和’pg’gem。
安装
http://postgresapp.com/
然后
PATH="/Applications/Postgres.app/Contents/MacOS/bin:$PATH"
然后
bundle install