Here is milter-greylist 4.5.7, which is just 4.5.6 with strndup removed:
ftp://ftp.espci.fr/pub/milter-greylist/milter-greylist-4.5.7.tgz
MD5 (milter-greylist-4.5.7.tgz) = 1e6a9626792f51cc37aca8a74543c11e
ChangeLog since 4.5.6:
Do not use strndup() for POSIX.1-2001 compatibility
--
Emmanuel Dreyfus
http://hcpnet.free.fr/pubz
manu@...Message
milter-greylisr 4.5.7 is available
2013-09-16 by manu@...