Just enough X11 to perform -- using CGo

x11.go

package main

// #cgo LDFLAGS: -lX11
// #include <X11/Xlib.h>
import "C"

import (
    "time"
)

func main() {
    d := C.XOpenDisplay(nil)
    s := C.XDefaultScreen(d)
    root := C.XRootWindow(d, s)
    w := C.XCreateSimpleWindow(d, root, 10, 10, 100, 100, 0, 0, 0xff0000)
    C.XSynchronize(d, 1)
    C.XMapWindow(d, w)
    C.XMoveResizeWindow(d, w, 100, 100, 200, 100)
    gc := C.XCreateGC(d, w, 0, nil)
    C.XSetForeground(d, gc, 0xffffff)
    hello := C.CString("hello world")
    C.XDrawString(d, w, gc, 10, 10, hello, 11 /*len(q)*/)
    C.XFlush(d)
    time.Sleep(2 * time.Second)
}