I'm currently testing out the 2.5.5 install, and during the configure process it fails with:
configure: error: Package requirements (wiredtiger) were not met: Package 'wiredtiger', required by 'virtual:world', not found
The documentation (--help) shows that this should be default to no: --enable-wt enable WiredTiger backend no|yes|mod [no]
However, this is not the case, and I have to manually set: ./configure --enable-wt=no