Gnuplot设置输出图片的格式时出错～解决方法

Gnuplot设置输出图片的格式时出错～～～～～～～
gnuplot> set terminal gif
Terminal type set to 'gif'
Could not find/open font when opening font "arial", using internal non-scalable font
Options are 'nocrop medium '



gnuplot> set term gif
Terminal type set to 'gif'
Could not find/open font when opening font "arial", using internal non-scalable font
Options are 'nocrop medium '



gnuplot> set term png
Terminal type set to 'png'
Could not find/open font when opening font "arial", using internal non-scalable font
Options are 'nocrop medium '
gnuplot> 


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