postgresql 9.1 - Rails 3 - 无法安装pg gem

问题描述：

我正在开发一个Rails应用程序，以在Mac OS X上推送到Heroku，当我尝试运行'gem install pg'时，出现以下错误。postgresql 9.1 - Rails 3 - 无法安装pg gem

Building native extensions. This could take a while... 
ERROR: Error installing pg: 
    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 rb_encdb_alias()... yes 
checking for rb_enc_alias()... 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 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-0.14.1 for inspection. 
Results logged to /usr/local/rvm/gems/ruby-1.9.3-p194/gems/pg-0.14.1/ext/gem_make.out

我已经在他们的网站上安装了使用Mac OS X安装程序的Postgres。

任何关于如何解决这个问题的帮助将会非常有用！

卸载刚刚安装的postgres（从他们的网站），而是用自制软件安装：'brew install postgresql'然后再次尝试安装pg gem。 – fmendez 2013-03-17 02:52:41

答

如果您使用Brew安装Postgres，则不会发生此问题。

postgresql 9.1 - Rails 3 - 无法安装pg gem

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