diff -u /home/karthik/.local/share/git/emacs-src/lisp/pcmpl-unix.el /home/karthik/.local/share/git/emacs-src/lisp/pcmpl-unix-new.el
--- emacs-src/lisp/pcmpl-unix.el	2021-07-02 18:50:29.556608640 -0700
+++ emacs-src/lisp/pcmpl-unix-new.el	2021-07-17 00:35:39.417290007 -0700
@@ -82,7 +82,8 @@
 ;;;###autoload
 (defun pcomplete/xargs ()
   "Completion for `xargs'."
-  ;; FIXME: Add completion of xargs-specific arguments.
+  (while (string-prefix-p "-" (pcomplete-arg 0))
+    (pcomplete-here (funcall pcomplete-default-completion-function)))
   (funcall pcomplete-command-completion-function)
   (funcall (or (pcomplete-find-completion-function (pcomplete-arg 1))
 	       pcomplete-default-completion-function)))