我在安装pgplot的时候,为什么我的png的格式可以输出,但是我的xwindow输出出现问题???
@j-X555LJ:~/pgplot_build$ ./pgdemo1
Graphics device/type (? to see list, default /xwindow):
PGPLOT /xw: Couldn't find program "pgxwin_server" in the directory named
PGPLOT /xw: in your PGPLOT_DIR environment variable, or in any directory
PGPLOT /xw: listed in your PATH environment variable.