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主要是修改了makefile
修改了平台判断
unix-like常见的应该也就Mac和Linux了吧(
linux中使用xdg-open打开编译好的pdf
参考linux.die.net的文档,
xdg-open
用于桌面上使用默认打开方式打开文件/url。与macos上的open用法一致。linux下假设使用evince打开pdf
close查找pid的时候修改成了evince。evince是ubuntu的默认文档编辑器,考虑到应该也很少人用其他发行版。