我的 Gemfile 中有以下 gem：
gem 'twitter-bootstrap-rails', :github => 'seyhunak/twitter-bootstrap-rails'
这是为这个项目：https ://github.com/seyhunak/twitter-bootstrap-rails
依赖项之一是 therubyracer ( https://github.com/seyhunak/twitter-bootstrap-rails/blob/master/twitter-bootstrap-rails.gemspec#L27 )：
s.add_dependency 'therubyracer', '>= 0.11.0beta5'
但是，当我尝试将其推送到 Heroku 时，出现以下错误：
Installing therubyracer (0.11.0beta8) with native extensions
Gem::Installer::ExtensionBuildError: ERROR: Failed to build gem native extension.
/usr/local/bin/ruby extconf.rb
checking for main() in -lpthread... yes
creating Makefile
make
g++ -I. -I/tmp/build_1feat0v36ur6g/vendor/bundle/ruby/1.9.1/gems/libv8-3.11.8.3-x86_64-linux/vendor/v8/include -I/usr/local/include/ruby-1.9.1/x86_64-linux -I/usr/local/include/ruby-1.9.1/ruby/backward -I/usr/local/include/ruby-1.9.1 -I. -Wall -g -rdynamic -fPIC -O3 -ggdb -Wextra -Wno-unused-parameter -Wno-parentheses -Wpointer-arith -Wwrite-strings -Wno-missing-field-initializers -Wno-long-long -o template.o -c template.cc
g++ -I. -I/tmp/build_1feat0v36ur6g/vendor/bundle/ruby/1.9.1/gems/libv8-3.11.8.3-x86_64-linux/vendor/v8/include -I/usr/local/include/ruby-1.9.1/x86_64-linux -I/usr/local/include/ruby-1.9.1/ruby/backward -I/usr/local/include/ruby-1.9.1 -I. -Wall -g -rdynamic -fPIC -O3 -ggdb -Wextra -Wno-unused-parameter -Wno-parentheses -Wpointer-arith -Wwrite-strings -Wno-missing-field-initializers -Wno-long-long -o array.o -c array.cc
g++ -I. -I/tmp/build_1feat0v36ur6g/vendor/bundle/ruby/1.9.1/gems/libv8-3.11.8.3-x86_64-linux/vendor/v8/include -I/usr/local/include/ruby-1.9.1/x86_64-linux -I/usr/local/include/ruby-1.9.1/ruby/backward -I/usr/local/include/ruby-1.9.1 -I. -Wall -g -rdynamic -fPIC -O3 -ggdb -Wextra -Wno-unused-parameter -Wno-parentheses -Wpointer-arith -Wwrite-strings -Wno-missing-field-initializers -Wno-long-long -o locker.o -c locker.cc
g++ -I. -I/tmp/build_1feat0v36ur6g/vendor/bundle/ruby/1.9.1/gems/libv8-3.11.8.3-x86_64-linux/vendor/v8/include -I/usr/local/include/ruby-1.9.1/x86_64-linux -I/usr/local/include/ruby-1.9.1/ruby/backward -I/usr/local/include/ruby-1.9.1 -I. -Wall -g -rdynamic -fPIC -O3 -ggdb -Wextra -Wno-unused-parameter -Wno-parentheses -Wpointer-arith -Wwrite-strings -Wno-missing-field-initializers -Wno-long-long -o constraints.o -c constraints.cc
g++ -I. -I/tmp/build_1feat0v36ur6g/vendor/bundle/ruby/1.9.1/gems/libv8-3.11.8.3-x86_64-linux/vendor/v8/include -I/usr/local/include/ruby-1.9.1/x86_64-linux -I/usr/local/include/ruby-1.9.1/ruby/backward -I/usr/local/include/ruby-1.9.1 -I. -Wall -g -rdynamic -fPIC -O3 -ggdb -Wextra -Wno-unused-parameter -Wno-parentheses -Wpointer-arith -Wwrite-strings -Wno-missing-field-initializers -Wno-long-long -o exception.o -c exception.cc
g++ -I. -I/tmp/build_1feat0v36ur6g/vendor/bundle/ruby/1.9.1/gems/libv8-3.11.8.3-x86_64-linux/vendor/v8/include -I/usr/local/include/ruby-1.9.1/x86_64-linux -I/usr/local/include/ruby-1.9.1/ruby/backward -I/usr/local/include/ruby-1.9.1 -I. -Wall -g -rdynamic -fPIC -O3 -ggdb -Wextra -Wno-unused-parameter -Wno-parentheses -Wpointer-arith -Wwrite-strings -Wno-missing-field-initializers -Wno-long-long -o context.o -c context.cc
g++ -I. -I/tmp/build_1feat0v36ur6g/vendor/bundle/ruby/1.9.1/gems/libv8-3.11.8.3-x86_64-linux/vendor/v8/include -I/usr/local/include/ruby-1.9.1/x86_64-linux -I/usr/local/include/ruby-1.9.1/ruby/backward -I/usr/local/include/ruby-1.9.1 -I. -Wall -g -rdynamic -fPIC -O3 -ggdb -Wextra -Wno-unused-parameter -Wno-parentheses -Wpointer-arith -Wwrite-strings -Wno-missing-field-initializers -Wno-long-long -o string.o -c string.cc
g++ -I. -I/tmp/build_1feat0v36ur6g/vendor/bundle/ruby/1.9.1/gems/libv8-3.11.8.3-x86_64-linux/vendor/v8/include -I/usr/local/include/ruby-1.9.1/x86_64-linux -I/usr/local/include/ruby-1.9.1/ruby/backward -I/usr/local/include/ruby-1.9.1 -I. -Wall -g -rdynamic -fPIC -O3 -ggdb -Wextra -Wno-unused-parameter -Wno-parentheses -Wpointer-arith -Wwrite-strings -Wno-missing-field-initializers -Wno-long-long -o value.o -c value.cc
g++ -I. -I/tmp/build_1feat0v36ur6g/vendor/bundle/ruby/1.9.1/gems/libv8-3.11.8.3-x86_64-linux/vendor/v8/include -I/usr/local/include/ruby-1.9.1/x86_64-linux -I/usr/local/include/ruby-1.9.1/ruby/backward -I/usr/local/include/ruby-1.9.1 -I. -Wall -g -rdynamic -fPIC -O3 -ggdb -Wextra -Wno-unused-parameter -Wno-parentheses -Wpointer-arith -Wwrite-strings -Wno-missing-field-initializers -Wno-long-long -o object.o -c object.cc
g++ -I. -I/tmp/build_1feat0v36ur6g/vendor/bundle/ruby/1.9.1/gems/libv8-3.11.8.3-x86_64-linux/vendor/v8/include -I/usr/local/include/ruby-1.9.1/x86_64-linux -I/usr/local/include/ruby-1.9.1/ruby/backward -I/usr/local/include/ruby-1.9.1 -I. -Wall -g -rdynamic -fPIC -O3 -ggdb -Wextra -Wno-unused-parameter -Wno-parentheses -Wpointer-arith -Wwrite-strings -Wno-missing-field-initializers -Wno-long-long -o message.o -c message.cc
g++ -I. -I/tmp/build_1feat0v36ur6g/vendor/bundle/ruby/1.9.1/gems/libv8-3.11.8.3-x86_64-linux/vendor/v8/include -I/usr/local/include/ruby-1.9.1/x86_64-linux -I/usr/local/include/ruby-1.9.1/ruby/backward -I/usr/local/include/ruby-1.9.1 -I. -Wall -g -rdynamic -fPIC -O3 -ggdb -Wextra -Wno-unused-parameter -Wno-parentheses -Wpointer-arith -Wwrite-strings -Wno-missing-field-initializers -Wno-long-long -o script.o -c script.cc
g++ -I. -I/tmp/build_1feat0v36ur6g/vendor/bundle/ruby/1.9.1/gems/libv8-3.11.8.3-x86_64-linux/vendor/v8/include -I/usr/local/include/ruby-1.9.1/x86_64-linux -I/usr/local/include/ruby-1.9.1/ruby/backward -I/usr/local/include/ruby-1.9.1 -I. -Wall -g -rdynamic -fPIC -O3 -ggdb -Wextra -Wno-unused-parameter -Wno-parentheses -Wpointer-arith -Wwrite-strings -Wno-missing-field-initializers -Wno-long-long -o signature.o -c signature.cc
g++ -I. -I/tmp/build_1feat0v36ur6g/vendor/bundle/ruby/1.9.1/gems/libv8-3.11.8.3-x86_64-linux/vendor/v8/include -I/usr/local/include/ruby-1.9.1/x86_64-linux -I/usr/local/include/ruby-1.9.1/ruby/backward -I/usr/local/include/ruby-1.9.1 -I. -Wall -g -rdynamic -fPIC -O3 -ggdb -Wextra -Wno-unused-parameter -Wno-parentheses -Wpointer-arith -Wwrite-strings -Wno-missing-field-initializers -Wno-long-long -o trycatch.o -c trycatch.cc
g++ -I. -I/tmp/build_1feat0v36ur6g/vendor/bundle/ruby/1.9.1/gems/libv8-3.11.8.3-x86_64-linux/vendor/v8/include -I/usr/local/include/ruby-1.9.1/x86_64-linux -I/usr/local/include/ruby-1.9.1/ruby/backward -I/usr/local/include/ruby-1.9.1 -I. -Wall -g -rdynamic -fPIC -O3 -ggdb -Wextra -Wno-unused-parameter -Wno-parentheses -Wpointer-arith -Wwrite-strings -Wno-missing-field-initializers -Wno-long-long -o stack.o -c stack.cc
g++ -I. -I/tmp/build_1feat0v36ur6g/vendor/bundle/ruby/1.9.1/gems/libv8-3.11.8.3-x86_64-linux/vendor/v8/include -I/usr/local/include/ruby-1.9.1/x86_64-linux -I/usr/local/include/ruby-1.9.1/ruby/backward -I/usr/local/include/ruby-1.9.1 -I. -Wall -g -rdynamic -fPIC -O3 -ggdb -Wextra -Wno-unused-parameter -Wno-parentheses -Wpointer-arith -Wwrite-strings -Wno-missing-field-initializers -Wno-long-long -o gc.o -c gc.cc
g++ -I. -I/tmp/build_1feat0v36ur6g/vendor/bundle/ruby/1.9.1/gems/libv8-3.11.8.3-x86_64-linux/vendor/v8/include -I/usr/local/include/ruby-1.9.1/x86_64-linux -I/usr/local/include/ruby-1.9.1/ruby/backward -I/usr/local/include/ruby-1.9.1 -I. -Wall -g -rdynamic -fPIC -O3 -ggdb -Wextra -Wno-unused-parameter -Wno-parentheses -Wpointer-arith -Wwrite-strings -Wno-missing-field-initializers -Wno-long-long -o backref.o -c backref.cc
g++ -I. -I/tmp/build_1feat0v36ur6g/vendor/bundle/ruby/1.9.1/gems/libv8-3.11.8.3-x86_64-linux/vendor/v8/include -I/usr/local/include/ruby-1.9.1/x86_64-linux -I/usr/local/include/ruby-1.9.1/ruby/backward -I/usr/local/include/ruby-1.9.1 -I. -Wall -g -rdynamic -fPIC -O3 -ggdb -Wextra -Wno-unused-parameter -Wno-parentheses -Wpointer-arith -Wwrite-strings -Wno-missing-field-initializers -Wno-long-long -o rr.o -c rr.cc
g++ -I. -I/tmp/build_1feat0v36ur6g/vendor/bundle/ruby/1.9.1/gems/libv8-3.11.8.3-x86_64-linux/vendor/v8/include -I/usr/local/include/ruby-1.9.1/x86_64-linux -I/usr/local/include/ruby-1.9.1/ruby/backward -I/usr/local/include/ruby-1.9.1 -I. -Wall -g -rdynamic -fPIC -O3 -ggdb -Wextra -Wno-unused-parameter -Wno-parentheses -Wpointer-arith -Wwrite-strings -Wno-missing-field-initializers -Wno-long-long -o date.o -c date.cc
g++ -I. -I/tmp/build_1feat0v36ur6g/vendor/bundle/ruby/1.9.1/gems/libv8-3.11.8.3-x86_64-linux/vendor/v8/include -I/usr/local/include/ruby-1.9.1/x86_64-linux -I/usr/local/include/ruby-1.9.1/ruby/backward -I/usr/local/include/ruby-1.9.1 -I. -Wall -g -rdynamic -fPIC -O3 -ggdb -Wextra -Wno-unused-parameter -Wno-parentheses -Wpointer-arith -Wwrite-strings -Wno-missing-field-initializers -Wno-long-long -o handles.o -c handles.cc
g++ -I. -I/tmp/build_1feat0v36ur6g/vendor/bundle/ruby/1.9.1/gems/libv8-3.11.8.3-x86_64-linux/vendor/v8/include -I/usr/local/include/ruby-1.9.1/x86_64-linux -I/usr/local/include/ruby-1.9.1/ruby/backward -I/usr/local/include/ruby-1.9.1 -I. -Wall -g -rdynamic -fPIC -O3 -ggdb -Wextra -Wno-unused-parameter -Wno-parentheses -Wpointer-arith -Wwrite-strings -Wno-missing-field-initializers -Wno-long-long -o v8.o -c v8.cc
g++ -I. -I/tmp/build_1feat0v36ur6g/vendor/bundle/ruby/1.9.1/gems/libv8-3.11.8.3-x86_64-linux/vendor/v8/include -I/usr/local/include/ruby-1.9.1/x86_64-linux -I/usr/local/include/ruby-1.9.1/ruby/backward -I/usr/local/include/ruby-1.9.1 -I. -Wall -g -rdynamic -fPIC -O3 -ggdb -Wextra -Wno-unused-parameter -Wno-parentheses -Wpointer-arith -Wwrite-strings -Wno-missing-field-initializers -Wno-long-long -o init.o -c init.cc
g++ -I. -I/tmp/build_1feat0v36ur6g/vendor/bundle/ruby/1.9.1/gems/libv8-3.11.8.3-x86_64-linux/vendor/v8/include -I/usr/local/include/ruby-1.9.1/x86_64-linux -I/usr/local/include/ruby-1.9.1/ruby/backward -I/usr/local/include/ruby-1.9.1 -I. -Wall -g -rdynamic -fPIC -O3 -ggdb -Wextra -Wno-unused-parameter -Wno-parentheses -Wpointer-arith -Wwrite-strings -Wno-missing-field-initializers -Wno-long-long -o heap.o -c heap.cc
g++ -I. -I/tmp/build_1feat0v36ur6g/vendor/bundle/ruby/1.9.1/gems/libv8-3.11.8.3-x86_64-linux/vendor/v8/include -I/usr/local/include/ruby-1.9.1/x86_64-linux -I/usr/local/include/ruby-1.9.1/ruby/backward -I/usr/local/include/ruby-1.9.1 -I. -Wall -g -rdynamic -fPIC -O3 -ggdb -Wextra -Wno-unused-parameter -Wno-parentheses -Wpointer-arith -Wwrite-strings -Wno-missing-field-initializers -Wno-long-long -o constants.o -c constants.cc
g++ -I. -I/tmp/build_1feat0v36ur6g/vendor/bundle/ruby/1.9.1/gems/libv8-3.11.8.3-x86_64-linux/vendor/v8/include -I/usr/local/include/ruby-1.9.1/x86_64-linux -I/usr/local/include/ruby-1.9.1/ruby/backward -I/usr/local/include/ruby-1.9.1 -I. -Wall -g -rdynamic -fPIC -O3 -ggdb -Wextra -Wno-unused-parameter -Wno-parentheses -Wpointer-arith -Wwrite-strings -Wno-missing-field-initializers -Wno-long-long -o external.o -c external.cc
g++ -I. -I/tmp/build_1feat0v36ur6g/vendor/bundle/ruby/1.9.1/gems/libv8-3.11.8.3-x86_64-linux/vendor/v8/include -I/usr/local/include/ruby-1.9.1/x86_64-linux -I/usr/local/include/ruby-1.9.1/ruby/backward -I/usr/local/include/ruby-1.9.1 -I. -Wall -g -rdynamic -fPIC -O3 -ggdb -Wextra -Wno-unused-parameter -Wno-parentheses -Wpointer-arith -Wwrite-strings -Wno-missing-field-initializers -Wno-long-long -o accessor.o -c accessor.cc
g++ -I. -I/tmp/build_1feat0v36ur6g/vendor/bundle/ruby/1.9.1/gems/libv8-3.11.8.3-x86_64-linux/vendor/v8/include -I/usr/local/include/ruby-1.9.1/x86_64-linux -I/usr/local/include/ruby-1.9.1/ruby/backward -I/usr/local/include/ruby-1.9.1 -I. -Wall -g -rdynamic -fPIC -O3 -ggdb -Wextra -Wno-unused-parameter -Wno-parentheses -Wpointer-arith -Wwrite-strings -Wno-missing-field-initializers -Wno-long-long -o function.o -c function.cc
g++ -I. -I/tmp/build_1feat0v36ur6g/vendor/bundle/ruby/1.9.1/gems/libv8-3.11.8.3-x86_64-linux/vendor/v8/include -I/usr/local/include/ruby-1.9.1/x86_64-linux -I/usr/local/include/ruby-1.9.1/ruby/backward -I/usr/local/include/ruby-1.9.1 -I. -Wall -g -rdynamic -fPIC -O3 -ggdb -Wextra -Wno-unused-parameter -Wno-parentheses -Wpointer-arith -Wwrite-strings -Wno-missing-field-initializers -Wno-long-long -o primitive.o -c primitive.cc
g++ -I. -I/tmp/build_1feat0v36ur6g/vendor/bundle/ruby/1.9.1/gems/libv8-3.11.8.3-x86_64-linux/vendor/v8/include -I/usr/local/include/ruby-1.9.1/x86_64-linux -I/usr/local/include/ruby-1.9.1/ruby/backward -I/usr/local/include/ruby-1.9.1 -I. -Wall -g -rdynamic -fPIC -O3 -ggdb -Wextra -Wno-unused-parameter -Wno-parentheses -Wpointer-arith -Wwrite-strings -Wno-missing-field-initializers -Wno-long-long -o invocation.o -c invocation.cc
g++ -shared -o init.so template.o array.o locker.o constraints.o exception.o context.o string.o value.o object.o message.o script.o signature.o trycatch.o stack.o gc.o backref.o rr.o date.o handles.o v8.o init.o heap.o constants.o external.o accessor.o function.o primitive.o invocation.o -L. -L/usr/local/lib -Wl,-R/usr/local/lib /tmp/build_1feat0v36ur6g/vendor/bundle/ruby/1.9.1/gems/libv8-3.11.8.3-x86_64-linux/vendor/v8/out/x64.release/obj.target/tools/gyp/libv8_base.a /tmp/build_1feat0v36ur6g/vendor/bundle/ruby/1.9.1/gems/libv8-3.11.8.3-x86_64-linux/vendor/v8/out/x64.release/obj.target/tools/gyp/libv8_snapshot.a -L. -rdynamic -Wl,-export-dynamic -lpthread -lpthread -lrt -ldl -lcrypt -lm -lc
/tmp/build_1feat0v36ur6g/vendor/bundle/ruby/1.9.1/gems/libv8-3.11.8.3-x86_64-linux/vendor/v8/out/x64.release/obj.target/tools/gyp/libv8_base.a: could not read symbols: No such file or directory
collect2: ld returned 1 exit status
make: *** [init.so] Error 1
Gem files will remain installed in /tmp/build_1feat0v36ur6g/vendor/bundle/ruby/1.9.1/gems/therubyracer-0.11.0beta8 for inspection.
Results logged to /tmp/build_1feat0v36ur6g/vendor/bundle/ruby/1.9.1/gems/therubyracer-0.11.0beta8/ext/v8/gem_make.out
An error occurred while installing therubyracer (0.11.0beta8), and Bundler cannot continue.
Make sure that `gem install therubyracer -v '0.11.0beta8'` succeeds before bundling.
!
! Failed to install gems via Bundler.
!
! Heroku push rejected, failed to compile Ruby/rails app
有人遇到过这种情况么？
我猜 Heroku 对 therubyracer 有问题，但是关于如何解决这个问题的任何想法？