makepackage runs as normal user, but somehow /tmp/apkg-fifoxxxxx end-up belonging to root.
ls -la /tmp
[skip]
-rw-r--r-- 1 root root 11 Aug 27 17:17 apkg-fifo32076
-rw-r--r-- 1 root root 11 Aug 24 14:58 apkg-fifo32264
[skip]
prw-r--r-- 1 root root 0 Aug 23 16:35 apkg-fifo5218
prw-r--r-- 1 root root 0 Aug 23 16:37 apkg-fifo5581
[skip]
And every run of makepakage ends with couple of dozen lines of
rm: cannot remove `/tmp/apkg-fifo1160': Operation not permitted
rm: cannot remove `/tmp/apkg-fifo16384': Operation not permitted
rm: cannot remove `/tmp/apkg-fifo1832': Operation not permitted
rm: cannot remove `/tmp/apkg-fifo23174': Operation not permitted
...
Not a big deal, just annoying :).