我正在尝试跑步bundle在我的 OSX 10.9 上的 Rails 项目中。到达时失败pg宝石出现此错误：
Gem::Installer::ExtensionBuildError: ERROR: Failed to build gem native extension.
/Users/kyledecot/.rvm/rubies/ruby-2.0.0-p247/bin/ruby extconf.rb
checking for pg_config... no
No pg_config... trying anyway. If building fails, please try again with
--with-pg-config=/path/to/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 PQsetSingleRowMode()... yes
checking for rb_encdb_alias()... yes
checking for rb_enc_alias()... no
checking for rb_thread_call_without_gvl()... yes
checking for rb_thread_call_with_gvl()... yes
checking for rb_thread_fd_select()... yes
checking for rb_w32_wrap_io_handle()... no
checking for PGRES_COPY_BOTH in libpq-fe.h... no
checking for PGRES_SINGLE_TUPLE in libpq-fe.h... no
checking for PG_DIAG_TABLE_NAME 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 "DESTDIR="
compiling gvl_wrappers.c
clang: warning: argument unused during compilation: '-fno-fast-math'
compiling pg.c
clang: warning: argument unused during compilation: '-fno-fast-math'
pg.c:272:9: warning: implicit declaration of function 'PQlibVersion' is invalid in C99 [-Wimplicit-function-declaration]
return INT2NUM(PQlibVersion());
^
In file included from pg.c:48:
In file included from ./pg.h:17:
In file included from /Users/kyledecot/.rvm/rubies/ruby-2.0.0-p247/include/ruby-2.0.0/ruby.h:33:
/Users/kyledecot/.rvm/rubies/ruby-2.0.0-p247/include/ruby-2.0.0/ruby/ruby.h:1167:21: note: instantiated from:
# define INT2NUM(v) INT2FIX((int)(v))
^
pg.c:272:9: note: instantiated from:
return INT2NUM(PQlibVersion());
^
pg.c:272:17: note: instantiated from:
return INT2NUM(PQlibVersion());
^
pg.c:375:48: error: use of undeclared identifier 'PQPING_OK'
rb_define_const(rb_mPGconstants, "PQPING_OK", INT2FIX(PQPING_OK));
^
pg.c:375:56: note: instantiated from:
rb_define_const(rb_mPGconstants, "PQPING_OK", INT2FIX(PQPING_OK));
^
pg.c:377:52: error: use of undeclared identifier 'PQPING_REJECT'
rb_define_const(rb_mPGconstants, "PQPING_REJECT", INT2FIX(PQPING_REJECT));
^
pg.c:377:60: note: instantiated from:
rb_define_const(rb_mPGconstants, "PQPING_REJECT", INT2FIX(PQPING_REJECT));
^
pg.c:379:57: error: use of undeclared identifier 'PQPING_NO_RESPONSE'
rb_define_const(rb_mPGconstants, "PQPING_NO_RESPONSE", INT2FIX(PQPING_NO_RESPONSE));
^
pg.c:379:65: note: instantiated from:
rb_define_const(rb_mPGconstants, "PQPING_NO_RESPONSE", INT2FIX(PQPING_NO_RESPONSE));
^
pg.c:381:56: error: use of undeclared identifier 'PQPING_NO_ATTEMPT'
rb_define_const(rb_mPGconstants, "PQPING_NO_ATTEMPT", INT2FIX(PQPING_NO_ATTEMPT));
^
pg.c:381:64: note: instantiated from:
rb_define_const(rb_mPGconstants, "PQPING_NO_ATTEMPT", INT2FIX(PQPING_NO_ATTEMPT));
^
1 warning and 4 errors generated.
make: *** [pg.o] Error 1
Gem files will remain installed in /Users/kyledecot/.rvm/gems/ruby-2.0.0-p247@skateboxes/gems/pg-0.17.0 for inspection.
Results logged to /Users/kyledecot/.rvm/gems/ruby-2.0.0-p247@skateboxes/gems/pg-0.17.0/ext/gem_make.out
An error occurred while installing pg (0.17.0), and Bundler cannot continue.
Make sure that `gem install pg -v '0.17.0'` succeeds before bundling.
另请确保您已升级 Xcode 以在 Mavericks 上重新安装命令行工具。
在终端类型中：
xcode-select --install
然后按照提示操作。
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