Hi, playing around with $[0] testlibpq2.c example. I wondered where HAVE_SYS_SELECT_H is defined?
I searched on the internet, founded that people also asked the same question in $[1]. In my machine, I do have <sys/select.h>. system version: Ubuntu 22.04.1 LTS gcc version: gcc (Ubuntu 11.3.0-1ubuntu1~22.04) 11.3.0 gcc compile command: gcc pg_testlibpq2.c -I/home/jian/postgres/pg16/include \ -L/home/jian/postgres/pg16/lib -lpq [0]https://www.postgresql.org/docs/current/libpq-example.html [1] https://stackoverflow.com/questions/37876850/in-compilation-time-how-to-find-the-macro-is-defined-in-which-header-file
