我正在尝试在运行 OS.X Mavericks 的 Mac 上安装 tiny_tds，但收到以下错误：
ERROR: Error installing tiny_tds:
ERROR: Failed to build gem native extension.
/System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/bin/ruby extconf.rb gem install tiny_tds -- --without-iconvlib --with-freetds-lib=/usr/local/Cellar/freetds/0.91/lib --with-freetds-include=/usr/local/Cellar/freetds/0.91/include
checking for iconv_open() in iconv.h... no
checking for iconv_open() in -lfalse... no
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libiconv is missing.
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*** extconf.rb failed ***
我正在使用以下命令安装 tiny_tds：
sudo gem install tiny_tds -- --with-freetds-include=/usr/local/include --with-freetds-lib=/usr/local/lib --with-iconv-include=/usr/local/Cellar/libiconv/1.14/include --with-iconv-lib=/usr/local/Cellar/libiconv/1.14/lib
我已经研究过了iconv.h，没有iconv_open()方法。
顺便说一句，我正在使用 ruby 2.0.0p451