这就是看我的Gemfile的方式：
source :rubygems
gem 'sinatra'
gem 'json'
gem 'tiny_tds'
将应用程序推送到Heroku的输出：
-----> Ruby app detected
-----> Compiling Ruby/Rack
-----> Using Ruby version: ruby-2.0.0
-----> Installing dependencies using 1.6.3
Running: bundle install --without development:test --path vendor/bundle --binstubs vendor/bundle/bin -j4 --deployment
The source :rubygems is deprecated because HTTP requests are insecure.
Please change your source to 'https://rubygems.org' if possible, or 'http://rubygems.org' if not.
Fetching gem metadata from http://rubygems.org/..........
Fetching additional metadata from http://rubygems.org/..
Installing rack 1.5.2
Using bundler 1.6.3
Installing sinatra 1.0
Gem::Installer::ExtensionBuildError: ERROR: Failed to build gem native extension.
/tmp/build_57173bf8-9a1a-4b28-8b51-57ba286f69b3/vendor/ruby-2.0.0/bin/ruby extconf.rb
checking for iconv_open() in iconv.h... yes
checking for sybfront.h... no
-----
freetds is missing.
-----
*** 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=/tmp/build_57173bf8-9a1a-4b28-8b51-57ba286f69b3/vendor/ruby-2.0.0/bin/ruby
--enable-lookup
--disable-lookup
--with-iconv-dir
--without-iconv-dir
--with-iconv-include
--without-iconv-include=${iconv-dir}/include
--with-iconv-lib
--without-iconv-lib=${iconv-dir}/
--with-freetds-dir
--without-freetds-dir
--with-freetds-include
--without-freetds-include=${freetds-dir}/include
--with-freetds-lib
--without-freetds-lib=${freetds-dir}/
Gem files will remain installed in /tmp/build_57173bf8-9a1a-4b28-8b51-57ba286f69b3/vendor/bundle/ruby/2.0.0/gems/tiny_tds-0.6.2 for inspection.
Results logged to /tmp/build_57173bf8-9a1a-4b28-8b51-57ba286f69b3/vendor/bundle/ruby/2.0.0/gems/tiny_tds-0.6.2/ext/tiny_tds/gem_make.out
Installing json 1.8.1
An error occurred while installing tiny_tds (0.6.2), and Bundler cannot
continue.
Make sure that `gem install tiny_tds -v '0.6.2'` succeeds before bundling.
Bundler Output: The source :rubygems is deprecated because HTTP requests are insecure.
Please change your source to 'https://rubygems.org' if possible, or 'http://rubygems.org' if not.
Fetching gem metadata from http://rubygems.org/..........
Fetching additional metadata from http://rubygems.org/..
Installing rack 1.5.2
Using bundler 1.6.3
Installing sinatra 1.0
Gem::Installer::ExtensionBuildError: ERROR: Failed to build gem native extension.
/tmp/build_57173bf8-9a1a-4b28-8b51-57ba286f69b3/vendor/ruby-2.0.0/bin/ruby extconf.rb
checking for iconv_open() in iconv.h... yes
checking for sybfront.h... no
-----
freetds is missing.
-----
*** 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=/tmp/build_57173bf8-9a1a-4b28-8b51-57ba286f69b3/vendor/ruby-2.0.0/bin/ruby
--enable-lookup
--disable-lookup
--with-iconv-dir
--without-iconv-dir
--with-iconv-include
--without-iconv-include=${iconv-dir}/include
--with-iconv-lib
--without-iconv-lib=${iconv-dir}/
--with-freetds-dir
--without-freetds-dir
--with-freetds-include
--without-freetds-include=${freetds-dir}/include
--with-freetds-lib
--without-freetds-lib=${freetds-dir}/
Gem files will remain installed in /tmp/build_57173bf8-9a1a-4b28-8b51-57ba286f69b3/vendor/bundle/ruby/2.0.0/gems/tiny_tds-0.6.2 for inspection.
Results logged to /tmp/build_57173bf8-9a1a-4b28-8b51-57ba286f69b3/vendor/bundle/ruby/2.0.0/gems/tiny_tds-0.6.2/ext/tiny_tds/gem_make.out
Installing json 1.8.1
An error occurred while installing tiny_tds (0.6.2), and Bundler cannot
continue.
Make sure that `gem install tiny_tds -v '0.6.2'` succeeds before bundling.
! Failed to install gems via Bundler.
运行完美。我尝试删除存储库并创建一个新的，或重新启动heroku。我如何在heroku上安装tiny_tds？怎么了？
编辑25 / jul / 14
发生此错误是因为您的dyno缺少freetds库。 使用这样的库需要使用自定义buildpack。互联网上有很多开源构建包。例如https://github.com/firmhouse/heroku-buildpack-ruby-freetds。
tnx to Damien（Heroku Support）
答案 0 :(得分：0)
我猜你已经使用C构建交换机在本地计算机上安装了TinyTDS gem，但未通过Bundler指定。您是否在本地主机上沙箱安装？例如
bundle install --binstubs --path=vendor
看看是否有效。我猜它应该失败，因为现在无法访问项目之外的其他宝石。然后使用bundle config使用the build switches suggested in the TinyTDS README