gem安装pg for ruby on rails
Postgresql不会在OSX上安装，这里是我的数据
安装pg（0.18.4）时发生n错误，Bundler无法继续。 在捆绑之前确保gem install pg -v '0.18.4'成功。 chriss-MacBook-Pro：shine chriswilson $ bundle exec安装用法：install [-bCcpSsv] [-B suffix] [-f flags] [-g group] [-m mode] [-o owner] file1 file2 install [-bCcpSsv ] [-B后缀] [-f flags] [-g group] [-m mode] [-o owner] file1 … fileN目录安装-d [-v] [-g group] [-m mode] [ -o owner]目录… chriss-MacBook-Pro：shine chriswilson $ gem install pg -v’0.18.4’构建原生扩展。 这可能需要一段时间…错误：安装pg时出错：错误：无法构建gem原生扩展。
current directory: /Users/chriswilson/.rvm/gems/ruby-2.3.0/gems/pg-0.18.4/ext /Users/chriswilson/.rvm/rubies/ruby-2.3.0/bin/ruby -r ./siteconf20160902-1617-e1qwb1.rb 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 --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/chriswilson/.rvm/rubies/ruby-2.3.0/bin/$(RUBY_BASE_NAME) --with-pg --without-pg --enable-windows-cross --disable-windows-cross --with-pg-config --without-pg-config --with-pg_config --without-pg_config --with-pg-dir --without-pg-dir --with-pg-include --without-pg-include=${pg-dir}/include --with-pg-lib --without-pg-lib=${pg-dir}/lib To see why this extension failed to compile, please check the mkmf.log which can be found here: /Users/chriswilson/.rvm/gems/ruby-2.3.0/extensions/x86_64-darwin-15/2.3.0/pg-0.18.4/mkmf.log extconf failed, exit code 1 Gem files will remain installed in /Users/chriswilson/.rvm/gems/ruby-2.3.0/gems/pg-0.18.4 for inspection. Results logged to /Users/chriswilson/.rvm/gems/ruby-2.3.0/extensions/x86_64-darwin-15/2.3.0/pg-0.18.4/gem_make.out chriss-MacBook-Pro:shine chriswilson$ gem install pg -v '0.18.4' Building native extensions. This could take a while... ERROR: Error installing pg: ERROR: Failed to build gem native extension. current directory: /Users/chriswilson/.rvm/gems/ruby-2.3.0/gems/pg-0.18.4/ext /Users/chriswilson/.rvm/rubies/ruby-2.3.0/bin/ruby -r ./siteconf20160902-1643-jfhxyo.rb 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 --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/chriswilson/.rvm/rubies/ruby-2.3.0/bin/$(RUBY_BASE_NAME) --with-pg --without-pg --enable-windows-cross --disable-windows-cross --with-pg-config --without-pg-config --with-pg_config --without-pg_config --with-pg-dir --without-pg-dir --with-pg-include --without-pg-include=${pg-dir}/include --with-pg-lib --without-pg-lib=${pg-dir}/lib To see why this extension failed to compile, please check the mkmf.log which can be found here: /Users/chriswilson/.rvm/gems/ruby-2.3.0/extensions/x86_64-darwin-15/2.3.0/pg-0.18.4/mkmf.log extconf failed, exit code 1 Gem files will remain installed in /Users/chriswilson/.rvm/gems/ruby-2.3.0/gems/pg-0.18.4 for inspection. Results logged to /Users/chriswilson/.rvm/gems/ruby-2.3.0/extensions/x86_64-darwin-15/2.3.0/pg-0.18.4/gem_make.out find_executable: checking for pg_config... -------------------- no -------------------- find_header: checking for libpq-fe.h... -------------------- no "gcc -o conftest -I/Users/chriswilson/.rvm/rubies/ruby-2.3.0/include/ruby-2.3.0/x86_64-darwin15 -I/Users/chriswilson/.rvm/rubies/ruby-2.3.0/include/ruby-2.3.0/ruby/backward -I/Users/chriswilson/.rvm/rubies/ruby-2.3.0/include/ruby-2.3.0 -I. -I/usr/local/opt/libyaml/include -I/usr/local/opt/readline/include -I/usr/local/opt/libksba/include -I/usr/local/opt/openssl/include -D_XOPEN_SOURCE -D_DARWIN_C_SOURCE -D_DARWIN_UNLIMITED_SELECT -D_REENTRANT -O3 -fno-fast-math -ggdb3 -Wall -Wextra -Wno-unused-parameter -Wno-parentheses -Wno-long-long -Wno-missing-field-initializers -Wunused-variable -Wpointer-arith -Wwrite-strings -Wdeclaration-after-statement -Wshorten-64-to-32 -Wimplicit-function-declaration -Wdivision-by-zero -Wdeprecated-declarations -Wextra-tokens -fno-common -pipe conftest.c -L. -L/Users/chriswilson/.rvm/rubies/ruby-2.3.0/lib -L/usr/local/opt/libyaml/lib -L/usr/local/opt/readline/lib -L/usr/local/opt/libksba/lib -L/usr/local/opt/openssl/lib -L. -fstack-protector -L/usr/local/lib -L/usr/local/opt/libyaml/lib -L/usr/local/opt/readline/lib -L/usr/local/opt/libksba/lib -L/usr/local/opt/openssl/lib -lruby.2.3.0 -lpthread -ldl -lobjc " checked program was: /* begin */ 1: #include "ruby.h" 2: 3: int main(int argc, char **argv) 4: { 5: return 0; 6: } /* end */ "gcc -E -I/Users/chriswilson/.rvm/rubies/ruby-2.3.0/include/ruby-2.3.0/x86_64-darwin15 -I/Users/chriswilson/.rvm/rubies/ruby-2.3.0/include/ruby-2.3.0/ruby/backward -I/Users/chriswilson/.rvm/rubies/ruby-2.3.0/include/ruby-2.3.0 -I. -I/usr/local/opt/libyaml/include -I/usr/local/opt/readline/include -I/usr/local/opt/libksba/include -I/usr/local/opt/openssl/include -D_XOPEN_SOURCE -D_DARWIN_C_SOURCE -D_DARWIN_UNLIMITED_SELECT -D_REENTRANT -O3 -fno-fast-math -ggdb3 -Wall -Wextra -Wno-unused-parameter -Wno-parentheses -Wno-long-long -Wno-missing-field-initializers -Wunused-variable -Wpointer-arith -Wwrite-strings -Wdeclaration-after-statement -Wshorten-64-to-32 -Wimplicit-function-declaration -Wdivision-by-zero -Wdeprecated-declarations -Wextra-tokens -fno-common -pipe conftest.c -o conftest.i" conftest.c:3:10: fatal error: 'libpq-fe.h' file not found #include ^ 1 error generated. checked program was: /* begin */ 1: #include "ruby.h" 2: 3: #include /* end */ --------------------
这基本上意味着您在设置中缺少库或程序。 我现在已经有过几次这个问题，所以这里有几个不同的尝试（希望其中一个适合你）：
安装一个常见的缺失库：
brew install libpqxx gem install pg
重新安装postgres（我不知道）：
brew uninstall postgresql brew install postgresql gem install pg
明确定义pg_config的路径：
1）获取pg_config的位置
which pg_config
2）将该路径传递给gem install
gem install pg --with-pg-config=/usr/pgsql-9.1/bin/pg_config