dev-python/pymongo $ ebuild pymongo-2.5.1.ebuild clean test

temp/pypy-c1.9/mongod.log

Fri May 24 14:47:10.016 [initandlisten] MongoDB starting : pid=5178 port=27017 dbpath=/mnt/gen2/TmpDir/portage/dev-python/pymongo-2.5$
Fri May 24 14:47:10.016 [initandlisten] db version v2.4.4-pre-
Fri May 24 14:47:10.016 [initandlisten] git version: nogitversion
Fri May 24 14:47:10.016 [initandlisten] build info: Linux archtester 3.4.11-tuxonice #4 SMP Mon Mar 4 16:00:33 WST 2013 x86_64 BOOST_$
Fri May 24 14:47:10.016 [initandlisten] allocator: tcmalloc
Fri May 24 14:47:10.016 [initandlisten] options: { bind_ip: "127.0.0.1", dbpath: "/mnt/gen2/TmpDir/portage/dev-python/pymongo-2.5.1/t$
Fri May 24 14:47:10.150 [FileAllocator] allocating new datafile /mnt/gen2/TmpDir/portage/dev-python/pymongo-2.5.1/temp/pypy-c1.9/mong$
Fri May 24 14:47:10.150 [FileAllocator] creating directory /mnt/gen2/TmpDir/portage/dev-python/pymongo-2.5.1/temp/pypy-c1.9/mongo.db/$
Fri May 24 14:47:10.150 [FileAllocator] done allocating datafile /mnt/gen2/TmpDir/portage/dev-python/pymongo-2.5.1/temp/pypy-c1.9/mon$
Fri May 24 14:47:10.151 [FileAllocator] allocating new datafile /mnt/gen2/TmpDir/portage/dev-python/pymongo-2.5.1/temp/pypy-c1.9/mong$
Fri May 24 14:47:10.151 [FileAllocator] done allocating datafile /mnt/gen2/TmpDir/portage/dev-python/pymongo-2.5.1/temp/pypy-c1.9/mon$
Fri May 24 14:47:10.160 [initandlisten] ERROR: listen(): bind() failed errno:99 Cannot assign requested address for socket: 127.0.0.1$
Fri May 24 14:47:10.160 [initandlisten] now exiting
Fri May 24 14:47:10.160 dbexit:
Fri May 24 14:47:10.160 [websvr] ERROR: listen(): bind() failed errno:99 Cannot assign requested address for socket: 127.0.0.1:28017
Fri May 24 14:47:10.160 [initandlisten] shutdown: going to close listening sockets...
Fri May 24 14:47:10.160 [initandlisten] shutdown: going to flush diaglog...
Fri May 24 14:47:10.160 [initandlisten] shutdown: going to close sockets...
Fri May 24 14:47:10.160 [initandlisten] shutdown: waiting for fs preallocator...
Fri May 24 14:47:10.160 [initandlisten] shutdown: closing all files...
Fri May 24 14:47:10.161 [initandlisten] closeAllFiles() finished
Fri May 24 14:47:10.161 [initandlisten] shutdown: removing fs lock...
Fri May 24 14:47:10.161 dbexit: really exiting now

I'm thinking something is missing here;

RDEPEND="dev-db/mongodb"
DEPEND="${RDEPEND}
dev-python/setuptools[${PYTHON_USEDEP}]
doc? ( dev-python/sphinx[${PYTHON_USEDEP}] )
test? ( dev-python/nose[${PYTHON_USEDEP}] )
kerberos? ( dev-python/pykerberos )"

What appears to have triggered this oddity is simply a recent upgrade of the system. This connected happily recently prior to an emerge -u world