If you've pulled petsc-dev in the past couple of hours - you might have some hg errors like:

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not updating, since new heads added (run 'hg heads' to see heads, 'hg merge' to merge) <<<<<<

If so - suggest doing: hg rollback [or alternatively] mv petsc-dev petsc-dev.old hg clone petsc-dev.old petsc-dev -r d3e10315d68b cp petsc-dev.old/.hg/hgrc petsc-dev/.hg/hgrc I've manually removed this bad state from petsc.cs.iit.edu/petsc/petsc-dev - so if you pull now - its ok [i.e you won't see the 2 heads with 'hg heads'] Satish