libpq@16 for Mac

libpq is the official C client interface library provided by PostgreSQL, aimed at developers who need to connect to PostgreSQL databases using C or C-compatible languages. It encapsulates low-level communication details such as establishing connections, sending queries, and receiving results into a set of functions, allowing programs to interact with the database without handling the network protocol themselves. It is suitable for developing database drivers, backend services, operations scripts, or any C program that needs to embed PostgreSQL access capabilities directly. As a development tool in a command-line environment, it is intended more for programmers than for ordinary users' daily software. If you are writing a C program and want to connect to PostgreSQL, this library is the officially recommended foundational component.