diff -uNr pacman-6.0.0/scripts/repo-add.sh.in pacman-termux/scripts/repo-add.sh.in
--- pacman-6.0.0/scripts/repo-add.sh.in	2021-05-20 06:38:45.961453200 +0300
+++ pacman-termux/scripts/repo-add.sh.in	2021-10-04 16:00:39.000000000 +0300
@@ -585,7 +585,7 @@
 	exit 1
 fi
 
-tmpdir=$(mktemp -d "${TMPDIR:-/tmp}/repo-tools.XXXXXXXXXX") || (\
+tmpdir=$(mktemp -d "${TMPDIR:-@TERMUX_PREFIX@/tmp}/repo-tools.XXXXXXXXXX") || (\
 	error "$(gettext "Cannot create temp directory for database building.")"; \
 	exit 1)