cc -O2 -pipe -pthread -Wall -Wextra -Werror -Wno-error=deprecated -Wno-error=deprecated-declarations aio/aio_cancel.c -o aio/aio_cancel -D_POSIX_C_SOURCE=202405L -lm -lpthread aio/aio_cancel.c:1:10: fatal error: 'aio.h' file not found #include ^~~~~~~ 1 error generated.