The mips64el build failed due to #681941 (a system call fails with
ECHILD in a situation where that seems to make no sense, but only ever
on Debian buildds):
https://buildd.debian.org/status/fetch.php?pkg=xapian-core&arch=mips64el&ver=1.4.3-2&stamp=1491430492&raw=0
Please give back the package so we can get a clean build:
gb xapian-core_1.4.3-2 . mips64el
Cheers,
Olly