These aren't getting regenerated even with "aclocal --force"; I think
it's because there is nothing to put in them. Running "aclocal
--verbose" shows that all the required macros are in acinclude.m4 files:
aclocal: saw macro PCAP_IS_SUITABLE
aclocal: saw macro RECVFROM_ARG6_TYPE
aclocal: saw macro PCAP_IS_SUITABLE
aclocal: saw macro CHECK_IPV6_IPPROTO_RAW
aclocal: saw macro APR_FIND_APR
aclocal: ../acinclude.m4 is already included by configure.ac