make -C /lib/modules/5.15.151-porteus/build M=/root/opemu-linux modules
make[1]: Entering directory '/mnt/sdb1/linux-5.15.151'
  CC [M]  /root/opemu-linux/trap_hook.o
/root/opemu-linux/trap_hook.c:59:23: error: field ‘ops’ has incomplete type
   59 |     struct ftrace_ops ops;
      |                       ^~~
/root/opemu-linux/trap_hook.c:148:40: warning: ‘struct ftrace_regs’ declared inside parameter list will not be visible outside of this definition or declaration
  148 |         struct ftrace_ops *ops, struct ftrace_regs *regs)
      |                                        ^~~~~~~~~~~
/root/opemu-linux/trap_hook.c: In function ‘fh_ftrace_thunk’:
/root/opemu-linux/trap_hook.c:156:13: error: invalid use of undefined type ‘struct ftrace_regs’
  156 |         regs->regs.ip = (unsigned long) hook->function;
      |             ^~
/root/opemu-linux/trap_hook.c: In function ‘fh_install_hook’:
/root/opemu-linux/trap_hook.c:181:23: error: ‘FTRACE_OPS_FL_SAVE_REGS’ undeclared (first use in this function)
  181 |     hook->ops.flags = FTRACE_OPS_FL_SAVE_REGS
      |                       ^~~~~~~~~~~~~~~~~~~~~~~
/root/opemu-linux/trap_hook.c:181:23: note: each undeclared identifier is reported only once for each function it appears in
/root/opemu-linux/trap_hook.c:182:23: error: ‘FTRACE_OPS_FL_RECURSION’ undeclared (first use in this function)
  182 |                     | FTRACE_OPS_FL_RECURSION
      |                       ^~~~~~~~~~~~~~~~~~~~~~~
/root/opemu-linux/trap_hook.c:183:23: error: ‘FTRACE_OPS_FL_IPMODIFY’ undeclared (first use in this function)
  183 |                     | FTRACE_OPS_FL_IPMODIFY;
      |                       ^~~~~~~~~~~~~~~~~~~~~~
make[2]: *** [scripts/Makefile.build:289: /root/opemu-linux/trap_hook.o] Error 1
make[1]: *** [Makefile:1907: /root/opemu-linux] Error 2
make[1]: Leaving directory '/mnt/sdb1/linux-5.15.151'
make: *** [Makefile:15: all] Error 2