diff -up source/texk/kpathsea/mktexlsr.than source/texk/kpathsea/mktexlsr
--- source/texk/kpathsea/mktexlsr.than	2015-04-29 16:52:42.800897655 +0200
+++ source/texk/kpathsea/mktexlsr	2015-04-29 16:53:12.500695909 +0200
@@ -66,7 +66,7 @@ if tty -s; then verbose=true; else verbo
 dry_run=false
 trees=
 
-treefile="${TMPDIR-/tmp}/mktexlsrtrees$$.tmp"
+treefile=`mktemp -q --tmpdir mktexlsrtrees.XXXXXXXXXX`
 trap 'cd /; rm -f $treefile; test -z "$db_dir_tmp" || rm -rf "$db_dir_tmp"; 
       exit' 0 1 2 3 7 13 15