无法在 g++ 中链接 libpqxx

Question

MacOS 12.2.2、clang 13.0.0、XCode 开发者工具已安装。 libpqxx 是随自制程序一起安装的，可以通过 include 找到，但链接器找不到该库。

> g++ main.cpp -lpq -lpqxx -I/opt/homebrew/include -std=c++2a
ld: library not found for -lpq
clang: error: linker command failed with exit code 1 (use -v to see invocation)

这是main.cpp

#include <iostream>
#include <pqxx/pqxx>

using namespace std;
using namespace pqxx;

int main(int argc, char* argv[]) {
   try {
      connection C("dbname = testdb user = pgtest password = pgtest \
      hostaddr = 127.0.0.1 port = 5432");
      if (C.is_open()) {
         cout << "Opened database successfully: " << C.dbname() << endl;
      } else {
         cout << "Can't open database" << endl;
         return 1;
      }
      C.close ();
   } catch (const std::exception &e) {
      cerr << e.what() << std::endl;
      return 1;
   }
}