执行以下操作，而不是符号链接到特定版本的freetype2:

Instead of symlinking to a specific version of freetype2, do this:

ln -s /usr/local/include/freetype2 /usr/local/include/freetype

这免除了升级freetype2时重新创建符号链接的麻烦.

This saves you the trouble of recreating the symlink whenever you upgrade freetype2.