In file included from ktrleak.c:36:
/usr/include/sys/ktrace.h:77:16: error: 'MAXCOMLEN' undeclared here (not in a function)
  char ktr_comm[MAXCOMLEN+1]; /* command name */
                ^~~~~~~~~
ktrleak.c: In function 'main':
ktrleak.c:166:13: warning: implicit declaration of function 'mmap' [-Wimplicit-function-declaration]
  badstack = mmap(NULL, 4096, PROT_NONE, MAP_ANON | MAP_PRIVATE, -1, 0);
             ^~~~
ktrleak.c:166:30: error: 'PROT_NONE' undeclared (first use in this function); did you mean 'DST_NONE'?
  badstack = mmap(NULL, 4096, PROT_NONE, MAP_ANON | MAP_PRIVATE, -1, 0);
                              ^~~~~~~~~
                              DST_NONE
ktrleak.c:166:30: note: each undeclared identifier is reported only once for each function it appears in
ktrleak.c:166:41: error: 'MAP_ANON' undeclared (first use in this function)
  badstack = mmap(NULL, 4096, PROT_NONE, MAP_ANON | MAP_PRIVATE, -1, 0);
                                         ^~~~~~~~
ktrleak.c:166:52: error: 'MAP_PRIVATE' undeclared (first use in this function)
  badstack = mmap(NULL, 4096, PROT_NONE, MAP_ANON | MAP_PRIVATE, -1, 0);
                                                    ^~~~~~~~~~~
ktrleak.c:167:18: error: 'MAP_FAILED' undeclared (first use in this function)
  if (badstack == MAP_FAILED) {
                  ^~~~~~~~~~