--- ./lisp/server.el.orig	2019-11-28 10:49:15.353433913 +0100
+++ ./lisp/server.el	2019-11-28 10:50:18.741175439 +0100
@@ -277,7 +277,7 @@
 	 (let ((xdg_runtime_dir (getenv "XDG_RUNTIME_DIR")))
 	   (if xdg_runtime_dir
 	       (format "%s/emacs" xdg_runtime_dir)
-	     (format "%s/emacs%d" (or (getenv "TMPDIR") "/tmp") (user-uid))))))
+	     (format "%s/emacs%d" "@TERMUX_PREFIX@/var/run" (user-uid))))))
   "The directory in which to place the server socket.
 If local sockets are not supported, this is nil.")