To use a hydraulic pump to power a building hoist, several basic requirements must be met: a reliable power source, a suitable hydraulic pump with the correct pressure and flow rate, a robust and leak-free hydraulic system, safety mechanisms such as pressure relief valves and emergency stop features, proper installation and maintenance procedures, and adherence to safety standards and regulations. Additionally, the pump should be compatible with the hoist's design and capable of providing the necessary force and speed for lifting operations. Regular inspections and maintenance are crucial to ensure the hoist operates safely and efficiently.