Compiling options --enable-epoll and --disable-epoll are not working.

I'm working on a project in which I need to run BIND 9 in an environment where SYS_epoll_create1 call is not supported. But I cannot compile directly in that environment. So I'm compiling BIND 9 on a supported machine.

From the source code, there are two options, --enable-epoll, --disable-epoll,that I can use to disable epoll.

But when I compiled the software with these options separately and tested them on the target environment, SYS_epoll_create1 call is still used.

So I wonder if anyone can help me solve this problem. Many thanks!