PG宝石无法安装

Question

我试图让Rails的使用Heroku的使用Cygwin工作，但我快到的时候我做

bundle install 

我敢肯定的Postgres安装的问题（我安装了一切与“Postgres的从Cygwin的SETUP.EXE它的标题，但我遇到了问题，

gem install pg 

，我不能让这些错误信息的意识

道歉，如果这个问题是平凡的;它我第一次尝试学习RoR。错误日志如下。提前致谢！

/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 

Answer 1

版本0.13的gem不支持PostgreSQL版本比8.3更旧。您需要升级您的Postgres或安装较旧的宝石（例如，gem install pg -v '< 0.13'）。

'pg'宝石如下PostgreSQL's versioning policy。