ruby on rails - Bundle errors when installing postgres gem -

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i trying install gem pg keep getting error returned in terminal. have pg installed, installed brew. ran gem install pg , tell me pg installed.

here error get. 

gem::installer::extensionbuilderror: error: failed build gem native extension.      /system/library/frameworks/ruby.framework/versions/2.0/usr/bin/ruby extconf.rb  checking pg_config... yes using config values /usr/local/bin/pg_config checking libpq-fe.h... yes checking libpq/libpq-fs.h... yes checking pg_config_manual.h... yes checking pqconnectdb() in -lpq... no checking pqconnectdb() in -llibpq... no checking pqconnectdb() in -lms/libpq... no can't find postgresql client library (libpq) *** extconf.rb failed *** not create makefile due reason, lack of necessary libraries and/or headers.  check mkmf.log file more details.  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=/system/library/frameworks/ruby.framework/versions/2.0/usr/bin/ruby     --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}/     --with-pqlib     --without-pqlib     --with-libpqlib     --without-libpqlib     --with-ms/libpqlib     --without-ms/libpqlib   gem files remain installed in /var/folders/l7/f3_r_hhs46lfprth_1pw57vw0000gn/t/bundler20150320-66140-15yne3b/pg-0.18.1/gems/pg-0.18.1 inspection. results logged /var/folders/l7/f3_r_hhs46lfprth_1pw57vw0000gn/t/bundler20150320-66140-15yne3b/pg-0.18.1/gems/pg-0.18.1/ext/gem_make.out error occurred while installing pg (0.18.1), , bundler cannot continue. make sure `gem install pg -v '0.18.1'` succeeds before bundling.

to tell system use gem have installed on machine

try 

brew install postgresql

or try 

archflags="-arch x86_64" bundle install

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