pg gem无法安装

本文介绍了pg gem无法安装的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

我想使Rails使用Cygwin使用heroku但我遇到问题，当我做

bundle安装

我确定postgres已经安装Cygwin的setup.exe但遇到了问题

gem install pg pre>

，我不能理解错误消息。

如果这个问题很琐碎， ;这是我第一次尝试学习RoR，错误日志如下：先感谢！

/ usr / bin / ruby​​。 exe extconf.rb 检查pg_config ... yes 使用/ usr / bin / pg_config中的配置值检查libpq-fe.h ...是检查libpq / libpq-fs.h ...是检查pg_config_manual.h ...是检查pqconnectdb（）在-lpq ...是检查PQconnectionUsedPassword（）。 ..没有检查PQisthreadsafe（）...是检查PQprepare（）...是检查PQexecParams（）...是检查PQescapeString ）...是检查PQescapeStringConn（）...是检查PQgetCancel（）...是检查lo_create（）...是检查pg_encoding_to_char（）...是检查pg_char_to_encoding（）...是检查PQsetClientEncoding（）...是检查rb_encdb_alias（）... no 检查rb_enc_alias（）... no 检查libpq-fe.h中的struct pgNotify.extra ...是检查unistd.h ...是检查ruby / st.h ... no 检查st.h ...是创建extconf.h 创建Makefile make gcc -I 。 -一世。 -I / usr / lib / ruby​​ / 1.8 / i386-cygwin -I。 -DRUBY_EXTCONF_H = \extconf.h\-I / us / include -g -O2 -pipe -fno-strict-aliasing -c pg.c gcc -I。 -一世。 -I / usr / lib / ruby​​ / 1.8 / i386-cygwin -I。 -DRUBY_EXTCONF_H = \extconf.h\-I / usr / include -g -O2 -pipe -fno-strict-aliasing -c pg_connection.c gcc -I。 -一世。 -I / usr / lib / ruby​​ / 1.8 / i386-cygwin -I。 -DRUBY_EXTCONF_H = \extconf.h\-I / usr / include -g -O2 -pipe -fno-strict-aliasing -c pg_result.c gcc -shared -s -o pg_ext.so pg .o pg_connection.o pg_result.o -L。 -L / usr / lib -L。 -L / usr / lib -Wl， - enable-auto-image-base， - enable-auto-import， - export-all -lruby -lpq -lrt -ldl -lcrypt pg_connection.o：在函数pgconn_connection_needs_password中： /usr/lib/ruby/gems/1.8/gems/pg-0.13.1/ext/pg_connection.c:714：未定义引用`_PQconnectionNeedsPassword' pg_connection.o ：在函数'pgconn_connection_used_pa​​ssword'中： /usr/lib/ruby/gems/1.8/gems/pg-0.13.1/ext/pg_connection.c:727：未定义引用`_PQconnectionUsedPassword' pg_connection。 o：在函数pgconn_lotruncate中： /usr/lib/ruby/gems/1.8/gems/pg-0.13.1/ext/pg_connection.c:2991：未定义对`_lo_truncate的引用 collect2 ：ld返回1退出状态 Makefile：152：目标`pg_ext.so'的配方失败 make：*** [pg_ext.so]错误1

解决方案

版本0.13的gem不支持版本低于8.3的PostgreSQL。您需要升级Postgres或安装旧的gem（例如 gem install pg -v'< 0.13'）。

pggem遵循 PostgreSQL的版本控制政策。

I'm trying to get Rails working with Cygwin using heroku but I'm running into problem when I do

bundle install

I'm pretty sure postgres is installed (I installed everything with 'postgres' in its title from Cygwin's setup.exe but am running into problems with

gem install pg

, and I can't make sense of the error messages.

Apologies if this problem is trivial; it's my first time trying to learn RoR. Error log is below. Thanks in advance!

/usr/bin/ruby.exe 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()... no checking for PQisthreadsafe()... yes checking for PQprepare()... yes checking for PQexecParams()... yes checking for PQescapeString()... yes checking for PQescapeStringConn()... 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 rb_encdb_alias()... no checking for rb_enc_alias()... no checking for struct pgNotify.extra in libpq-fe.h... yes checking for unistd.h... yes checking for ruby/st.h... no checking for st.h... yes creating extconf.h creating Makefile make gcc -I. -I. -I/usr/lib/ruby/1.8/i386-cygwin -I. -DRUBY_EXTCONF_H=\"extconf.h\" -I/us /include -g -O2 -pipe -fno-strict-aliasing -c pg.c gcc -I. -I. -I/usr/lib/ruby/1.8/i386-cygwin -I. -DRUBY_EXTCONF_H=\"extconf.h\" -I/usr/include -g -O2 -pipe -fno-strict-aliasing -c pg_connection.c gcc -I. -I. -I/usr/lib/ruby/1.8/i386-cygwin -I. -DRUBY_EXTCONF_H=\"extconf.h\" -I/usr/include -g -O2 -pipe -fno-strict-aliasing -c pg_result.c gcc -shared -s -o pg_ext.so pg.o pg_connection.o pg_result.o -L. -L/usr/lib -L. -L/usr/lib -Wl,--enable-auto-image-base,--enable-auto-import,--export-all -lruby -lpq -lrt -ldl -lcrypt pg_connection.o: In function 'pgconn_connection_needs_password': /usr/lib/ruby/gems/1.8/gems/pg-0.13.1/ext/pg_connection.c:714: undefined reference to `_PQconnectionNeedsPassword' pg_connection.o: In function 'pgconn_connection_used_password': /usr/lib/ruby/gems/1.8/gems/pg-0.13.1/ext/pg_connection.c:727: undefined reference to `_PQconnectionUsedPassword' pg_connection.o: In function 'pgconn_lotruncate': /usr/lib/ruby/gems/1.8/gems/pg-0.13.1/ext/pg_connection.c:2991: undefined reference to `_lo_truncate' collect2: ld returned 1 exit status Makefile:152: recipe for target `pg_ext.so' failed make: *** [pg_ext.so] Error 1

解决方案

Version 0.13 of the gem doesn't support versions of PostgreSQL older than 8.3. You'll either need to upgrade your Postgres or install an older gem (e.g., gem install pg -v '< 0.13').

The 'pg' gem follows PostgreSQL's versioning policy.