The postPatch attribute is already in the function argument but is unused elsewhere in the code, so setting postPatch with buildRebar3 is going to end up in a no-op. This now allows to use postPatch within buildRebar3 by simply appending to the existing postPatch hook that removes the rebar and rebar3 escripts. Signed-off-by: aszlig <aszlig@redmoonstudios.org> Cc: @ericbmerritt