[RUBY] ruby/gd安裝

用gem install ruby-gd 都會跳出錯誤訊息

Fetching: ruby-gd-0.8.0.gem (100%)
Building native extensions.  This could take a while...
ERROR:  Error installing ruby-gd:
 ERROR: Failed to build gem native extension.

    /usr/local/Cellar/ruby/2.0.0-p0/bin/ruby extconf.rb
checking for main() in -lz... yes
checking for main() in -lpng... yes
checking for gdImagePng() in -lgd... 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/Cellar/ruby/2.0.0-p0/bin/ruby
 --with-gd-dir
 --without-gd-dir
 --with-gd-include
 --without-gd-include=${gd-dir}/include
 --with-gd-lib
 --without-gd-lib=${gd-dir}/
 --with-xpm
 --without-xpm
 --with-jpeg
 --without-jpeg
 --with-ttf
 --without-ttf
 --with-xpm
 --without-xpm
 --with-freetype
 --without-freetype
 --with-zlib
 --without-zlib
 --with-pnglib
 --without-pnglib
 --with-gdlib
 --without-gdlib


Gem files will remain installed in /usr/local/Cellar/ruby/2.0.0-p0/lib/ruby/gems/2.0.0/gems/ruby-gd-0.8.0 for inspection.
Results logged to /usr/local/Cellar/ruby/2.0.0-p0/lib/ruby/gems/2.0.0/gems/ruby-gd-0.8.0/./gem_make.out

所以改去網站用抓的 然後手動

$ tar xfvz ruby-GD-0.7.4.tar.gz
  $ cd ruby-GD-0.7.4
  $ ruby extconf.rb --with-ttf --with-freetype
  $ make
  $ sudo make install