我做了一个捆绑更新。现在，我正在尝试将我的应用程序推送到 Heroku，但它无法正常工作：
这是我得到的错误：
Installing pg (0.12.1) with native extensions /usr/ruby1.8.7/lib/ruby/site_ruby/1.8/rubygems/installer.rb:483:in `build_extensions': ERROR: Failed to build gem native extension. (Gem::Installer::ExtensionBuildError)
/usr/ruby1.8.7/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()... 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
pg currently requires the ruby/st.h header
*** extconf.rb failed ***
Could not create Makefile due to some reason, probably lack of
necessary libraries and/or headers. Check the mkmf.log file for more
details. You may need configuration options.
Provided configuration options:
--with-opt-dir
--without-opt-dir
--with-opt-include
--without-opt-include=${opt-dir}/include
--with-opt-lib
--without-opt-lib=${opt-dir}/lib
--with-make-prog
--without-make-prog
--srcdir=.
--curdir
--ruby=/usr/ruby1.8.7/bin/ruby
--with-pg
--without-pg
--with-pg-dir
--without-pg-dir
--with-pg-include
--without-pg-include=${pg-dir}/include
--with-pg-lib
--without-pg-lib=${pg-dir}/lib
--with-pg-config
--without-pg-config
--with-pg_config
--without-pg_config
--with-pqlib
--without-pqlib
--enable-static-build
--disable-static-build
Gem files will remain installed in /disk1/tmp/build_2ss3rr1i4kv9j/.bundle/gems/ruby/1.8/gems/pg-0.12.1 for inspection.
Results logged to /disk1/tmp/build_2ss3rr1i4kv9j/.bundle/gems/ruby/1.8/gems/pg-0.12.1/ext/gem_make.out
from /usr/ruby1.8.7/lib/ruby/site_ruby/1.8/rubygems/installer.rb:446:in `each'
from /usr/ruby1.8.7/lib/ruby/site_ruby/1.8/rubygems/installer.rb:446:in `build_extensions'
from /usr/ruby1.8.7/lib/ruby/site_ruby/1.8/rubygems/installer.rb:198:in `install'
from /usr/ruby1.8.7/lib/ruby/gems/1.8/gems/bundler-1.0.7/lib/bundler/source.rb:95:in `install'
from /usr/ruby1.8.7/lib/ruby/gems/1.8/gems/bundler-1.0.7/lib/bundler/installer.rb:55:in `run'
from /usr/ruby1.8.7/lib/ruby/gems/1.8/gems/bundler-1.0.7/lib/bundler/spec_set.rb:12:in `each'
from /usr/ruby1.8.7/lib/ruby/gems/1.8/gems/bundler-1.0.7/lib/bundler/spec_set.rb:12:in `each'
from /usr/ruby1.8.7/lib/ruby/gems/1.8/gems/bundler-1.0.7/lib/bundler/installer.rb:44:in `run'
from /usr/ruby1.8.7/lib/ruby/gems/1.8/gems/bundler-1.0.7/lib/bundler/installer.rb:8:in `install'
from /usr/ruby1.8.7/lib/ruby/gems/1.8/gems/bundler-1.0.7/lib/bundler/cli.rb:225:in `install'
from /usr/ruby1.8.7/lib/ruby/gems/1.8/gems/bundler-1.0.7/lib/bundler/vendor/thor/task.rb:22:in `send'
from /usr/ruby1.8.7/lib/ruby/gems/1.8/gems/bundler-1.0.7/lib/bundler/vendor/thor/task.rb:22:in `run'
from /usr/ruby1.8.7/lib/ruby/gems/1.8/gems/bundler-1.0.7/lib/bundler/vendor/thor/invocation.rb:118:in `invoke_task'
from /usr/ruby1.8.7/lib/ruby/gems/1.8/gems/bundler-1.0.7/lib/bundler/vendor/thor.rb:246:in `dispatch'
from /usr/ruby1.8.7/lib/ruby/gems/1.8/gems/bundler-1.0.7/lib/bundler/vendor/thor/base.rb:389:in `start'
from /usr/ruby1.8.7/lib/ruby/gems/1.8/gems/bundler-1.0.7/bin/bundle:13
from /usr/ruby1.8.7/bin/bundle:19:in `load'
from /usr/ruby1.8.7/bin/bundle:19
FAILED: http://devcenter.heroku.com/articles/bundler
！Heroku 推送被拒绝，无法通过 Bundler 安装 gem
有任何想法吗？提前致谢！