cc -pthread  -Wall -Wextra ppoll-block-sleep-write-raise.c -o ppoll-block-sleep-write-raise -D_GNU_SOURCE -D_BSD_SOURCE -D_ALL_SOURCE -D_DEFAULT_SOURCE -lm -lpthread -lrt 
relibc getrlimit(3, 0x7ffffffffc90): not implemented
relibc getrusage(0, 0x7ffffffffb60): not implemented
relibc getrlimit(7, 0x7ffffffff970): not implemented
/usr/lib/gcc/x86_64-unknown-redox/13.2.0/../../../../x86_64-unknown-redox/bin/ld: ../out/redox/signal/ppoll-block-sleep-write-raise.o: in function `main':
ppoll-block-sleep-write-raise.c:(.text+0x882): undefined reference to `ppoll'
collect2: error: ld returned 1 exit status