安装条形码生成工具gbarcode
安装gbarcode之前先安装barcode包，否则会报错：
ERROR:? Error installing gbarcode:
??? ERROR: Failed to build gem native extension.
??????? /usr/local/system/ruby/bin/ruby extconf.rb
checking for main() in -lbarcode... no
*** 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/system/ruby/bin/ruby
??? --with-barcode-dir
??? --without-barcode-dir
??? --with-barcode-include
??? --without-barcode-include=${barcode-dir}/include
??? --with-barcode-lib
??? --without-barcode-lib=${barcode-dir}/lib
??? --with-barcodelib
??? --without-barcodelib
extconf.rb:10: GNU Barcode is no longer bundled with the gbarcode gem. Please install GNU barcode before installing this gem (Exception)
所以先下载barcode包，ftp://ftp.gnu.org/pub/gnu/barcode/，然后tar -zxvf barcode-0.98.tar.gz，
cd barcode-0.98
./configure
make && make install
barcode安装完成后再安装gbarcode，? gem install gbarcode
转自：http://blog.sina.com.cn/s/blog_600e56a60100pkdv.html
