Error building Qemu 2.12.0 on Fedora 31 GCC 9.2.1 with the below error

[Viktor Madarasz]

Hi

Im trying to build Qemu 2.12.0 on Fedora 31 with GCC 9.2.1 as this 
particular qemu version is the only one working for my 
qemu-systems-ppc64 emulation I need

./configure runs with no problem but running make breaks at this point.

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  CC      aarch64_be-linux-user/accel/tcg/cpu-exec-common.o
  CC      aarch64_be-linux-user/accel/tcg/translate-all.o
  CC      aarch64_be-linux-user/accel/tcg/translator.o
  CC      aarch64_be-linux-user/accel/tcg/user-exec.o
  CC      aarch64_be-linux-user/accel/tcg/user-exec-stub.o
  CC      aarch64_be-linux-user/linux-user/main.o
  CC      aarch64_be-linux-user/linux-user/syscall.o
/home/viktormadarasz/Emulator/qemu-2.12.0/linux-user/ioctls.h:176:9: 
error: ‘SIOCGSTAMP’ undeclared here (not in a function); did you mean 
‘SIOCSRARP’?
  176 |   IOCTL(SIOCGSTAMP, IOC_R, MK_PTR(MK_STRUCT(STRUCT_timeval)))
      |         ^~~~~~~~~~
/home/viktormadarasz/Emulator/qemu-2.12.0/linux-user/syscall.c:5678:23: 
note: in definition of macro ‘IOCTL’
 5678 |     { TARGET_ ## cmd, cmd, #cmd, access, 0, {  __VA_ARGS__ } },
      |                       ^~~
/home/viktormadarasz/Emulator/qemu-2.12.0/linux-user/ioctls.h:177:9: 
error: ‘SIOCGSTAMPNS’ undeclared here (not in a function); did you mean 
‘SIOCGSTAMP_OLD’?
  177 |   IOCTL(SIOCGSTAMPNS, IOC_R, MK_PTR(MK_STRUCT(STRUCT_timespec)))
      |         ^~~~~~~~~~~~
/home/viktormadarasz/Emulator/qemu-2.12.0/linux-user/syscall.c:5678:23: 
note: in definition of macro ‘IOCTL’
 5678 |     { TARGET_ ## cmd, cmd, #cmd, access, 0, {  __VA_ARGS__ } },
      |                       ^~~
make[1]: *** [/home/viktormadarasz/Emulator/qemu-2.12.0/rules.mak:66: 
linux-user/syscall.o] Error 1
make: *** [Makefile:478: subdir-aarch64_be-linux-user] Error 2
[viktormadarasz@m93pserver qemu-2.12.0]$ make >> makeerror
make[1]: flex: Command not found
make[1]: bison: Command not found
make[1]: flex: Command not found
/home/viktormadarasz/Emulator/qemu-2.12.0/linux-user/ioctls.h:176:9: 
error: ‘SIOCGSTAMP’ undeclared here (not in a function); did you mean 
‘SIOCSRARP’?
  176 |   IOCTL(SIOCGSTAMP, IOC_R, MK_PTR(MK_STRUCT(STRUCT_timeval)))
      |         ^~~~~~~~~~
/home/viktormadarasz/Emulator/qemu-2.12.0/linux-user/syscall.c:5678:23: 
note: in definition of macro ‘IOCTL’
 5678 |     { TARGET_ ## cmd, cmd, #cmd, access, 0, {  __VA_ARGS__ } },
      |                       ^~~
/home/viktormadarasz/Emulator/qemu-2.12.0/linux-user/ioctls.h:177:9: 
error: ‘SIOCGSTAMPNS’ undeclared here (not in a function); did you mean 
‘SIOCGSTAMP_OLD’?
  177 |   IOCTL(SIOCGSTAMPNS, IOC_R, MK_PTR(MK_STRUCT(STRUCT_timespec)))
      |         ^~~~~~~~~~~~
/home/viktormadarasz/Emulator/qemu-2.12.0/linux-user/syscall.c:5678:23: 
note: in definition of macro ‘IOCTL’
 5678 |     { TARGET_ ## cmd, cmd, #cmd, access, 0, {  __VA_ARGS__ } },
      |                       ^~~
make[1]: *** [/home/viktormadarasz/Emulator/qemu-2.12.0/rules.mak:66: 
linux-user/syscall.o] Error 1
make: *** [Makefile:478: subdir-aarch64_be-linux-user] Error 2


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Thanks a lot for helping


Viktor