So, I made a couple of changes: 

20784 update Metacello since last update failed 
https://pharo.fogbugz.com/f/cases/20784

and from a previous integration: 

20176 Error in ByteArray>>booleanAt:
https://pharo.fogbugz.com/f/cases/20176

20762 Pharo 6.1 has `pharo6.0.x` platform attribute instead of `pharo6.1.x`
https://pharo.fogbugz.com/f/cases/20762

20103 Minor glitch in source code diff tool
https://pharo.fogbugz.com/f/cases/20103


So, the recent problems should be fixed. Now I can backport iceberg 0.6.4 :)

cheers!
Esteban