Disclaimer: I'm not a Buddhist, but I'm somewhat familiar with Zen Buddhism.
Buddhism is about liberation from suffering by letting go of attachments to the material world. According to Buddhism, the material world is an illusion and we shouldn't be concerned about what goes on in it. Getting attached to stuff happening in the material world only causes us stress and suffering, and for no reason, because (according to Buddhism) it is an illusion.
Existentialism, in contrast, says that we should make our own meaning, which is to say that we should find something in the world and decide that this is the reason for our life. In the Buddhist perspective this is only attachment, and harmful; why should that particular part of the world be so important? It only causes suffering to attach yourself to something in the world. Buddhists say this even extends to interpersonal attachments; we should avoid excess attachment even to a friend, family member, or romantic partner. Buddhism is like Stoicism in this regard.
However, Buddhism does not say we should just withdraw from the world entirely. It advocates the practice of loving-kindness towards all living things (without attachment to any living thing in particular), and following the Eightfold Path.
Camus thinks we need to find meaning in this life, otherwise we have no reason not to just kill ourselves. The Buddhist answer to this is that if you killed yourself you would just reincarnate and continue suffering, so it is no escape.
I don't want to say that Buddhists think the "meaning" of life is to free yourself from the cycle of attachment and suffering. If you practice Zen in order to achieve something else, even if that something else is "enlightenment" or "freedom from suffering," then you are wasting your time. Because, you don't want to get attached to the idea of enlightenment or the idea of freedom from suffering. That's harmful attachment that causes suffering if you fail to achieve what you wanted, just like being attached to something in the material world. The purpose of Zen is just to sit, and that's all.
If you are trying to attain enlightenment, you are creating and being driven by karma, and you are wasting your time on your black cushion.
- Sunryu Suzuki
But, Buddhism in general is oriented towards freeing oneself from attachment and suffering, even if doing so with purposeful intent is the wrong state of mind.