cc -O2 -pthread  -Wall -Wextra -Werror -Wno-error=deprecated -Wno-error=deprecated-declarations unistd/_PC_REC_INCR_XFER_SIZE.c -o unistd/_PC_REC_INCR_XFER_SIZE -D_POSIX_C_SOURCE=202405L  -lm -lpthread -lrt  -lintl -lcrypt
unistd/_PC_REC_INCR_XFER_SIZE.c:2:17: error: '_PC_REC_INCR_XFER_SIZE' undeclared here (not in a function)
    2 | int const foo = _PC_REC_INCR_XFER_SIZE;
      |                 ^~~~~~~~~~~~~~~~~~~~~~