vpopmail warning

[Said Madrus]

Dear all,
i have installed vpopmail-3.4.11-2, but when installing some message appear
like this:
opensmtp.o: In function `tcprules_open':
/source/vpopmail/vpopmail-3.4.11-2.released/opensmtp.c(.text+0x5d): warning:
mktemp() possibly used unsafely; consider using mkstemp()
anybody know what does it mean ??
thanks.

~said madrus