I am running Both BC and IC right now with no issues.
But that just sounds so cool a copper tree with pipe wire leaves
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The version of buildcraft i found that works without issue is compiled a by a guy named denoflion
https://github.com/denoflionsx/BuildCraft-Distro
use this version - buildcraft-A-MC1.4.5-Mod3.2.0.10-Forge-6.4.0.394