diff -uNr vim-8.2.0000/src/os_unix.h vim-8.2.0000.mod/src/os_unix.h
--- vim-8.2.0000/src/os_unix.h	2019-12-12 15:18:35.000000000 +0200
+++ vim-8.2.0000.mod/src/os_unix.h	2019-12-20 19:27:51.141441414 +0200
@@ -350,7 +350,7 @@
 # ifdef VMS
 #  define DFLT_DIR     "./,sys$login:,tmp:"
 # else
-#  define DFLT_DIR     ".,~/tmp,/var/tmp,/tmp" // default for 'directory'
+#  define DFLT_DIR     ".,~/tmp,@TERMUX_PREFIX@/tmp,@TERMUX_PREFIX@/var/tmp" // default for 'directory'
 # endif
 #endif