我们来看看这个的底部.
看起来有一些冲突,我从GitHub的gem开发人员获得了关于我对Ruby / Rails / Bundler / Homebrew的经验的辅助帮助,所以这不完全是他们的错误：P
但是我需要弄清楚如何尽快解决这个问题,所以这里跟我目前的这个问题的状态一样.

更新：2/25/2013
更新GCC / XCODE版本4.6(4H127)并下载最新版本的XCODE命令工具
现在,在extconf检查器中显示iconv_open().
现在我得到这些错误：

我相信他们现在是tiny_tds的问题,并且与最新的xcode路径兼容.

Gem::Installer::ExtensionBuildError: ERROR: Failed to build gem native extension.

            /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/bin/ruby extconf.rb 
    checking for iconv_open() in iconv.h... yes
    checking for sybfront.h... yes
    checking for sybdb.h... yes
    checking for tdsdbopen() in -lsybdb... yes
    checking for ct_bind() in -lct... yes
    creating Makefile

    make
    xcrun cc -I. -I. -I/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/universal-darwin12.0 -I. -DHAVE_ICONV_OPEN -DHAVE_SYBFRONT_H -DHAVE_SYBDB_H -I-I/usr/local/PHP5/include -I-I/usr/include -I-I/usr/local/include -I-I/opt/local/include -I-I/usr/local/MacGPG2/include -I-I/opt/sm/pkg/active/include -I/usr/local/PHP5/include -I/usr/include -I/usr/local/include -I/opt/local/include -I/usr/local/MacGPG2/include -I/opt/sm/pkg/active/include  -D_XOPEN_SOURCE -D_DARWIN_C_SOURCE   -fno-common  -g -Os -pipe -fno-common -DENABLE_DTRACE  -fno-common  -pipe -fno-common    -c client.c
    xcrun: Error: could not stat active Xcode path '/Developer'. (No such file or directory)
    xcrun cc -I. -I. -I/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/universal-darwin12.0 -I. -DHAVE_ICONV_OPEN -DHAVE_SYBFRONT_H -DHAVE_SYBDB_H -I-I/usr/local/PHP5/include -I-I/usr/include -I-I/usr/local/include -I-I/opt/local/include -I-I/usr/local/MacGPG2/include -I-I/opt/sm/pkg/active/include -I/usr/local/PHP5/include -I/usr/include -I/usr/local/include -I/opt/local/include -I/usr/local/MacGPG2/include -I/opt/sm/pkg/active/include  -D_XOPEN_SOURCE -D_DARWIN_C_SOURCE   -fno-common  -g -Os -pipe -fno-common -DENABLE_DTRACE  -fno-common  -pipe -fno-common    -c result.c
    xcrun: Error: could not stat active Xcode path '/Developer'. (No such file or directory)
    xcrun cc -I. -I. -I/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/universal-darwin12.0 -I. -DHAVE_ICONV_OPEN -DHAVE_SYBFRONT_H -DHAVE_SYBDB_H -I-I/usr/local/PHP5/include -I-I/usr/include -I-I/usr/local/include -I-I/opt/local/include -I-I/usr/local/MacGPG2/include -I-I/opt/sm/pkg/active/include -I/usr/local/PHP5/include -I/usr/include -I/usr/local/include -I/opt/local/include -I/usr/local/MacGPG2/include -I/opt/sm/pkg/active/include  -D_XOPEN_SOURCE -D_DARWIN_C_SOURCE   -fno-common  -g -Os -pipe -fno-common -DENABLE_DTRACE  -fno-common  -pipe -fno-common    -c tiny_tds_ext.c
    xcrun: Error: could not stat active Xcode path '/Developer'. (No such file or directory)
    cc  -pipe -bundle -undefined dynamic_lookup -o tiny_tds.bundle client.o result.o tiny_tds_ext.o -L. -L/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib -L/usr/local/heroku/lib -L/usr/local/PHP5/lib -L/usr/local/Cellar/ruby/1.9.3-p194/lib -L/usr/lib -L/usr/local/lib -L/opt/local/lib -L/usr/local/MacGPG2/lib -L/opt/sm/pkg/active/lib -L/Users/rountrjf/.rvm/lib -L/usr/local/Cellar/vertx/lib -L/usr/local/Cellar/vertx/mods/node.vert.x/lib -L/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib -L.       -lruby -lct -lsybdb  -lpthread -ldl -lobjc   
    i686-apple-darwin11-llvm-gcc-4.2: client.o: No such file or directory
    i686-apple-darwin11-llvm-gcc-4.2: result.o: No such file or directory
    i686-apple-darwin11-llvm-gcc-4.2: tiny_tds_ext.o: No such file or directory
    make: *** [tiny_tds.bundle] Error 1

Alright,since /Developer doesn't exist.
I used `sudo xcode-select -switch /Applications/Xcode.app/Contents/Developer` thinking that would fix it.  Now I'm back to square one... iconv_open() not found when checked with `extconf.rb`

更新2：2/25/2013
OKAY,所以我重新安装了所有的东西,Ruby / Rails等
并从评论者使用一些建议来使用“：path =>”
当我运行rails时,这里是我的输出

/Users/rountrjf/.rvm/gems/ruby-1.9.3-p392/gems/activesupport-3.2.12/lib/active_support/dependencies.rb:251:in `require': cannot load such file -- tiny_tds (LoadError)
    from /Users/rountrjf/.rvm/gems/ruby-1.9.3-p392/gems/activesupport-3.2.12/lib/active_support/dependencies.rb:251:in `block in require'
    from /Users/rountrjf/.rvm/gems/ruby-1.9.3-p392/gems/activesupport-3.2.12/lib/active_support/dependencies.rb:236:in `load_dependency'
    from /Users/rountrjf/.rvm/gems/ruby-1.9.3-p392/gems/activesupport-3.2.12/lib/active_support/dependencies.rb:251:in `require'
    from /Users/rountrjf/.rvm/gems/ruby-1.9.3-p392/gems/activerecord-sqlserver-adapter-3.2.10/lib/active_record/connection_adapters/sqlserver_adapter.rb:31:in `sqlserver_connection'
    from /Users/rountrjf/.rvm/gems/ruby-1.9.3-p392/gems/activerecord-3.2.12/lib/active_record/connection_adapters/abstract/connection_pool.rb:315:in `new_connection'

我被追查了

1.)初始EASY设置说明,如任何其他…

$rails new test_app
$cd test_app

现在将这些行添加到Gemfile

gem 'tiny_tds'
gem 'activerecord-sqlserver-adapter'

现在继续命令…

$bundle install

Fetching gem Metadata from https://rubygems.org/...........
Fetching gem Metadata from https://rubygems.org/..
Resolving dependencies...
Using rake (10.0.3) 
Using i18n (0.6.1) 
Using multi_json (1.6.1) 
Using activesupport (3.2.12) 
Using builder (3.0.4) 
Using activemodel (3.2.12) 
Using erubis (2.7.0) 
Using journey (1.0.4) 
Using rack (1.4.5) 
Using rack-cache (1.2) 
Using rack-test (0.6.2) 
Using hike (1.2.1) 
Using tilt (1.3.3) 
Using sprockets (2.2.2) 
Using actionpack (3.2.12) 
Using mime-types (1.21) 
Using polyglot (0.3.3) 
Using treetop (1.4.12) 
Using mail (2.4.4) 
Using actionmailer (3.2.12) 
Using arel (3.0.2) 
Using tzinfo (0.3.35) 
Using activerecord (3.2.12) 
Using activerecord-sqlserver-adapter (3.2.10) 
Using activeresource (3.2.12) 
Using bundler (1.2.4) 
Using coffee-script-source (1.4.0) 
Using execjs (1.4.0) 
Using coffee-script (2.2.0) 
Using rack-ssl (1.3.3) 
Using json (1.7.7) 
Using rdoc (3.12.1) 
Using thor (0.17.0) 
Using railties (3.2.12) 
Using coffee-rails (3.2.2) 
Using jquery-rails (2.2.1) 
Using rails (3.2.12) 
Using sass (3.2.5) 
Using sass-rails (3.2.6) 
Installing tiny_tds (0.5.1) with native extensions 
Gem::Installer::ExtensionBuildError: ERROR: Failed to build gem native extension.

        /usr/local/Cellar/ruby/1.9.3-p194/bin/ruby extconf.rb 
checking for iconv_open() in iconv.h... no
checking for iconv_open() in -liconv... no
-----
libiconv 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=/usr/local/Cellar/ruby/1.9.3-p194/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}/lib
    --with-freetds-dir
    --without-freetds-dir
    --with-freetds-include
    --without-freetds-include=${freetds-dir}/include
    --with-freetds-lib
    --without-freetds-lib=${freetds-dir}/lib
    --with-iconvlib
    --without-iconvlib


Gem files will remain installed in /usr/local/Cellar/ruby/1.9.3-p194/lib/ruby/gems/1.9.1/gems/gems/tiny_tds-0.5.1 for inspection.
Results logged to /usr/local/Cellar/ruby/1.9.3-p194/lib/ruby/gems/1.9.1/gems/gems/tiny_tds-0.5.1/ext/tiny_tds/gem_make.out
An error occurred while installing tiny_tds (0.5.1),and Bundler cannot continue.
Make sure that `gem install tiny_tds -v '0.5.1'` succeeds before bundling.

输出tsql -C

$tsql -C
Compile-time settings (established with the "configure" script)
                            Version: freetds v0.91
             freetds.conf directory: /usr/local/Cellar/freetds/0.91/etc
     MS db-lib source compatibility: no
        Sybase binary compatibility: no
                      Thread safety: yes
                      iconv library: yes
                        TDS version: 7.1
                              iODBC: yes
                           unixodbc: no
              SSPI "trusted" logins: no
                           Kerberos: no

2.)图像成功/假冒它使它/一个大的下降/高级设置说明
找到这个博客条目…
http://talltroym.blogspot.com/2012/04/installing-activerecord-sqlserver.html

然后我找到我正确的路径到libiconv库和freetds库.
接下来,我这样运行：

$sudo gem install tiny_tds -- --with-iconv-include=/usr/local/Cellar/libiconv/1.14/include --with-iconv-lib=/usr/local/Cellar/libiconv/1.14/lib --with-freetds-lib=/usr/local/Cellar/freetds/0.91/lib --with-freetds-include=/usr/local/Cellar/freetds/0.91/include
Password:
Building native extensions.  This could take a while...
Successfully installed tiny_tds-0.5.1
1 gem installed
Installing ri documentation for tiny_tds-0.5.1...
Installing RDoc documentation for tiny_tds-0.5.1...

再次尝试了bundle_install,还有冲击…仍然没有通过gem“tiny_tds”在Gemfile中安装…

所以我从Gemfile中删除tiny_tds,然后继续启动服务器…
正如所料

$rails s
=> Booting WEBrick
=> Rails 3.2.12 application starting in development on http://0.0.0.0:3000
=> Call with -d to detach
=> Ctrl-C to shutdown server
Exiting
/usr/local/Cellar/ruby/1.9.3-p194/lib/ruby/gems/1.9.1/gems/gems/activesupport-3.2.12/lib/active_support/dependencies.rb:251:in `require': cannot load such file -- tiny_tds (LoadError)
...

3.)MINI PORTILE

$sudo gem install mini_portile
$sudo gem install rakecompiler
$rake TINYTDS_FREETDS_VERSION="current"
Could not find gem 'tiny_tds (>= 0) ruby' in the gems available on this machine.
Run `bundle install` to install missing gems.

其他相关问题和资源

> Error installing TinyTDS on OSX 10.6 via gem install tiny_tds
(完全没有信息…由于事实并不奏效
.)
> FreeTDS Mac OS X MiniPortile
(对于小型运动员的方法或如何使用不太了解
它…)
> Homebrew / TinyTDS / FreeTDS bundle error
(涉及到linux,而不是Mac)
> ROR + Unable to install tiny_tds
> http://talltroym.blogspot.com/2012/04/installing-activerecord-sqlserver.html
(一个给我虚假希望的博客条目)
> https://github.com/rails-sqlserver/tiny_tds/issues/71(github问题我评论了,在那里我收到一些建议,我不太明白能够转化成一个成功的故事)
> https://github.com/rails-sqlserver/tiny_tds(github for tiny_tds gem)