Impossible to upgrade the system due to lib32-mesa

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http://chakra-project.org – Hi everyone, i have this problem when i'm trying to dosudo pacman -Syuit doesnt upgrade anything saying that lib32-mesa request lib32-libgl.I cannot install lib32-libgl cos is in conflict with lib32-nvidia-utils-bumblebee.I had it lib32-libgl but one or two weeks ago, during an upgrade, lib32-nvidia-utils-bumblebee removed the installed lib32-libgl. Until today  i hadn't any problem.My repos are synced i allready checkedThxs in advance (HowTos)