termux-packages/packages/emacs/lib-src-emacsclient.c.patch

--- ../emacsclient.c.orig	2019-08-29 20:08:48.840624090 +0200
+++ ./lib-src/emacsclient.c	2019-08-29 20:13:37.425382182 +0200
@@ -1289,11 +1289,12 @@
               }
             else
 #endif
-              tmpdir = "/tmp";
+              tmpdir = "@TERMUX_PREFIX@/tmp";
           }
+	/* Use $PREFIX/var/run instead of $TMPDIR in termux. */
 	socket_name_storage =
-	  xmalloc (strlen (tmpdir) + strlen (server_name) + EXTRA_SPACE);
-	char *z = stpcpy (socket_name_storage, tmpdir);
+	  xmalloc (strlen ("@TERMUX_PREFIX@/var/run") + strlen (server_name) + EXTRA_SPACE);
+	char *z = stpcpy (socket_name_storage, "@TERMUX_PREFIX@/var/run");
 	z += sprintf (z, "/emacs%ld/", uid);
 	strcpy (z, server_name);
 	local_socket_name = socket_name_storage;