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D:\awdwr\ActiveCoach-18Feb09>gem install ruby-gd
Building native extensions.  This could take a while...
ERROR:  Error installing ruby-gd:
        ERROR: Failed to build gem native extension.

C:/Ruby/bin/ruby.exe extconf.rb install ruby-gd
checking for main() in z.lib... 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
        --srcdir=.
        --curdir
        --ruby=C:/Ruby/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}/lib
        --with-xpm
        --without-xpm
        --with-jpeg
        --without-jpeg
        --with-ttf
        --without-ttf
        --with-xpm
        --without-xpm
        --with-freetype
        --without-freetype
        --with-zlib
        --without-zlib


Gem files will remain installed in C:/Ruby/lib/ruby/gems/1.8/gems/ruby-gd-0.8.0 for inspection.
Results logged to C:/Ruby/lib/ruby/gems/1.8/gems/ruby-gd-0.8.0/gem_make.out