As of writing the current version of BleakHouse is 4.1.1.
BleakHouse patches ruby to insert the memory monitoring code. Version 4.1.1 bundles ruby 1.8.6 patch level 230. Unfortunately, attempting to install the gem fails because of a patch failure. Fixing the patching problem leads to double-deallocation and other problems at run-time.
We applied the patches to ruby 1.8.6 patch level 114. The BleakHouse patches change the patchlevel in the version number to be 901.