所以，我刚刚花了一天中最好的时间来尝试正确安装 Rails（和所需的 gem）。
在使用线路缓存和 nokogiri 几个小时后，我开始感到筋疲力尽，现在遇到了安装“pg”gem 的问题。
我将继续战斗，但这里有什么关于这个问题的建议吗？
（而且我知道我不应该在 1 个 SO 帖子中问两个问题，但无论如何我都会问。我过去安装了大量软件（包括从头开始编译 Linux 内核），而且 Rails 似乎很难安装Snow Leopard。与让 Linux 显示驱动程序在过去糟糕的日子里工作相提并论。在简化这个过程方面是否有任何进展？）
错误日志是：
Using linecache19 (0.5.12)
Installing nokogiri (1.5.0) with native extensions
Installing pg (0.12.2) with native extensions
Gem::Installer::ExtensionBuildError: ERROR: Failed to build gem native extension.
/Users/user/.rvm/rubies/ruby-1.9.2-p318/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 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 PQgetCancel()... yes
checking for lo_create()... yes
checking for pg_encoding_to_char()... yes
checking for PQsetClientEncoding()... yes
checking for rb_encdb_alias()... yes
checking for rb_enc_alias()... yes
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
/usr/bin/gcc-4.2 -I. -I/Users/user/.rvm/rubies/ruby-1.9.2-p318/include/ruby-1.9.1/x86_64-darwin11.3.0 -I/Users/user/.rvm/rubies/ruby-1.9.2-p318/include/ruby-1.9.1/ruby/backward -I/Users/user/.rvm/rubies/ruby-1.9.2-p318/include/ruby-1.9.1 -I. -DRUBY_EXTCONF_H=\"extconf.h\" -I/Users/user/.rvm/usr/include -D_XOPEN_SOURCE -D_DARWIN_C_SOURCE -I/usr/include -fno-common -O3 -ggdb -Wextra -Wno-unused-parameter -Wno-parentheses -Wpointer-arith -Wwrite-strings -Wno-missing-field-initializers -Wshorten-64-to-32 -Wno-long-long -fno-common -pipe -o compat.o -c compat.c
/usr/bin/gcc-4.2 -I. -I/Users/user/.rvm/rubies/ruby-1.9.2-p318/include/ruby-1.9.1/x86_64-darwin11.3.0 -I/Users/user/.rvm/rubies/ruby-1.9.2-p318/include/ruby-1.9.1/ruby/backward -I/Users/user/.rvm/rubies/ruby-1.9.2-p318/include/ruby-1.9.1 -I. -DRUBY_EXTCONF_H=\"extconf.h\" -I/Users/user/.rvm/usr/include -D_XOPEN_SOURCE -D_DARWIN_C_SOURCE -I/usr/include -fno-common -O3 -ggdb -Wextra -Wno-unused-parameter -Wno-parentheses -Wpointer-arith -Wwrite-strings -Wno-missing-field-initializers -Wshorten-64-to-32 -Wno-long-long -fno-common -pipe -o pg.o -c pg.c
pg.c: In function ‘pgconn_exec’:
pg.c:954: warning: implicit conversion shortens 64-bit value into a 32-bit value
pg.c:993: warning: implicit conversion shortens 64-bit value into a 32-bit value
pg.c: In function ‘pgconn_prepare’:
pg.c:1059: warning: implicit conversion shortens 64-bit value into a 32-bit value
pg.c: In function ‘pgconn_exec_prepared’:
pg.c:1150: warning: implicit conversion shortens 64-bit value into a 32-bit value
pg.c:1180: warning: implicit conversion shortens 64-bit value into a 32-bit value
pg.c: In function ‘pgconn_s_escape’:
pg.c:1324: warning: implicit conversion shortens 64-bit value into a 32-bit value
pg.c:1331: warning: implicit conversion shortens 64-bit value into a 32-bit value
pg.c: In function ‘pgconn_send_query’:
pg.c:1504: warning: implicit conversion shortens 64-bit value into a 32-bit value
pg.c:1543: warning: implicit conversion shortens 64-bit value into a 32-bit value
pg.c: In function ‘pgconn_send_prepare’:
pg.c:1608: warning: implicit conversion shortens 64-bit value into a 32-bit value
pg.c: In function ‘pgconn_send_query_prepared’:
pg.c:1697: warning: implicit conversion shortens 64-bit value into a 32-bit value
pg.c:1728: warning: implicit conversion shortens 64-bit value into a 32-bit value
pg.c: In function ‘pgconn_wait_for_notify’:
pg.c:2103: warning: implicit conversion shortens 64-bit value into a 32-bit value
pg.c: In function ‘pgconn_put_copy_data’:
pg.c:2173: warning: implicit conversion shortens 64-bit value into a 32-bit value
pg.c: In function ‘pgconn_block’:
pg.c:2586: warning: implicit conversion shortens 64-bit value into a 32-bit value
pg.c:2592: warning: format not a string literal and no format arguments
pg.c:2607: warning: format not a string literal and no format arguments
pg.c: In function ‘pgconn_locreate’:
pg.c:2870: warning: implicit conversion shortens 64-bit value into a 32-bit value
pg.c: In function ‘find_or_create_johab’:
pg.c:3940: warning: comparison between signed and unsigned
pg.c:3946: warning: comparison between signed and unsigned
pg.c: In function ‘pgconn_get_client_encoding_as_rb_encoding’:
pg.c:3974: warning: comparison between signed and unsigned
pg.c: In function ‘pgconn_get_rb_encoding_as_pg_encname’:
pg.c:4006: warning: comparison between signed and unsigned
pg.c: In function ‘pgconn_internal_encoding_set’:
pg.c:4065: warning: comparison between signed and unsigned
pg.c: In function ‘pgconn_external_encoding’:
pg.c:4121: warning: comparison between signed and unsigned
/usr/bin/gcc-4.2 -dynamic -bundle -o pg_ext.bundle compat.o pg.o -L. -L/Users/user/.rvm/rubies/ruby-1.9.2-p318/lib -L/Users/user/.rvm/usr/lib -L. -L/usr/local/lib -L/usr/lib -Wl,-undefined,dynamic_lookup -Wl,-multiply_defined,suppress -Wl,-flat_namespace -lruby.1.9.1 -lpq -lpthread -ldl -lobjc
ld: in /usr/local/lib/libssl.0.9.8.dylib, missing required architecture x86_64 in file for architecture x86_64
collect2: ld returned 1 exit status
make: *** [pg_ext.bundle] Error 1
Gem files will remain installed in /Users/user/.rvm/gems/ruby-1.9.2-p318/gems/pg-0.12.2 for inspection.
Results logged to /Users/user/.rvm/gems/ruby-1.9.2-p318/gems/pg-0.12.2/ext/gem_make.out
An error occured while installing pg (0.12.2), and Bundler cannot continue.
Make sure that `gem install pg -v '0.12.2'` succeeds before bundling.