there might be envs which need Xlib.h - dwm - dynamic window manager
  HTML git clone https://git.parazyd.org/dwm
   DIR Log
   DIR Files
   DIR Refs
   DIR README
   DIR LICENSE
       ---
   DIR commit 01022b95d65612462972bdd009896ba6fdd3063a
   DIR parent b2f276b0f9f15131b0f4a03b46c8bedefbc89eea
  HTML Author: Anselm R. Garbe <garbeam@gmail.com>
       Date:   Sun, 16 Sep 2007 20:02:42 +0200
       
       there might be envs which need Xlib.h
       Diffstat:
         M dwm.c                               |       1 +
       
       1 file changed, 1 insertion(+), 0 deletions(-)
       ---
   DIR diff --git a/dwm.c b/dwm.c
       @@ -41,6 +41,7 @@
        #include <X11/cursorfont.h>
        #include <X11/keysym.h>
        #include <X11/Xatom.h>
       +#include <X11/Xlib.h>
        #include <X11/Xproto.h>
        #include <X11/Xutil.h>