file: db-4.2.52.bb URI is set to downloads.sleepycat.com, where berkeley db files are no more located. URL must be changed to: SRC_URI = "http://download.oracle.com/berkeley-db/db-${PV}.tar.gz ......" After modification, is working fine for me.
This has already been fixed in Poky svn and in the 3.1.1 release.
Closing bug URL change was done in revision 4008