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Eclipse 不允许我包含 iostream，它说未解决的包含。我在 mac 10.8.2 上，并且还下载了 Xcode。我读了一些关于去偏好和添加新路径的内容，但它没有奏效。请帮忙！
未解决的包含： iostream Program gcc not found on PATH Program g++ not found on PATH