    # File ext/RMagick/extconf.rb, line 81
    def check_partial_imagemagick_versions()
       prefix = config_string("prefix")
       matches = [
         prefix+"/lib/lib?agick*",
         prefix+"/include/ImageMagick",
         prefix+"/bin/Magick-config",
       ].map do |file_glob|
         Dir.glob(file_glob)
       end
       matches.delete_if { |arr| arr.empty? }
       if 0 < matches.length and matches.length < 3
          msg = "\nWarning: Found a partial ImageMagick installation. Your operating system likely has some built-in ImageMagick libraries but not all of ImageMagick. This will most likely cause problems at both compile and runtime.\nFound partial installation at: "+prefix+"\n"
          Logging::message msg
          message msg
       end
    end