K 10 svn:author V 2 bz K 8 svn:date V 27 2012-07-08T10:46:55.009856Z K 7 svn:log V 336 MFC r235941: in_cksum.h required ip.h to be included for struct ip. To be able to use some general checksum functions like in_addword() in a non-IPv4 context, limit the (also exported to user space) IPv4 specific functions to the times, when the ip.h header is present and IPVERSION is defined (to 4). Approved by: re END