Performing C SOURCE FILE Test CMAKE_HAVE_LIBC_PTHREAD failed with the following output:
Change Dir: /tmp/instance-13/output-1/build/zeek-4.1.1/buildroot-build/libkqueue-build/CMakeFiles/CMakeTmp

Run Build Command(s):/usr/bin/gmake -f Makefile cmTC_dfe54/fast && gmake[1]: Entering directory '/tmp/instance-13/output-1/build/zeek-4.1.1/buildroot-build/libkqueue-build/CMakeFiles/CMakeTmp'
/usr/bin/gmake  -f CMakeFiles/cmTC_dfe54.dir/build.make CMakeFiles/cmTC_dfe54.dir/build
gmake[2]: Entering directory '/tmp/instance-13/output-1/build/zeek-4.1.1/buildroot-build/libkqueue-build/CMakeFiles/CMakeTmp'
Building C object CMakeFiles/cmTC_dfe54.dir/src.c.o
/tmp/instance-13/output-1/host/bin/aarch64-none-linux-gnu-gcc --sysroot=/tmp/instance-13/output-1/host/aarch64-buildroot-linux-gnu/sysroot -DCMAKE_HAVE_LIBC_PTHREAD  -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -Og -g0 -D_FORTIFY_SOURCE=2   -DNDEBUG -fPIE -o CMakeFiles/cmTC_dfe54.dir/src.c.o -c /tmp/instance-13/output-1/build/zeek-4.1.1/buildroot-build/libkqueue-build/CMakeFiles/CMakeTmp/src.c
Linking C executable cmTC_dfe54
/tmp/instance-13/output-1/host/bin/cmake -E cmake_link_script CMakeFiles/cmTC_dfe54.dir/link.txt --verbose=1
/tmp/instance-13/output-1/host/bin/aarch64-none-linux-gnu-gcc --sysroot=/tmp/instance-13/output-1/host/aarch64-buildroot-linux-gnu/sysroot -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -Og -g0 -D_FORTIFY_SOURCE=2   -DNDEBUG CMakeFiles/cmTC_dfe54.dir/src.c.o -o cmTC_dfe54 
/tmp/instance-13/output-1/host/opt/ext-toolchain/bin/../lib/gcc/aarch64-none-linux-gnu/10.3.1/../../../../aarch64-none-linux-gnu/bin/ld: CMakeFiles/cmTC_dfe54.dir/src.c.o: in function `main':
src.c:(.text+0x20): undefined reference to `pthread_create'
/tmp/instance-13/output-1/host/opt/ext-toolchain/bin/../lib/gcc/aarch64-none-linux-gnu/10.3.1/../../../../aarch64-none-linux-gnu/bin/ld: src.c:(.text+0x28): undefined reference to `pthread_detach'
/tmp/instance-13/output-1/host/opt/ext-toolchain/bin/../lib/gcc/aarch64-none-linux-gnu/10.3.1/../../../../aarch64-none-linux-gnu/bin/ld: src.c:(.text+0x30): undefined reference to `pthread_cancel'
/tmp/instance-13/output-1/host/opt/ext-toolchain/bin/../lib/gcc/aarch64-none-linux-gnu/10.3.1/../../../../aarch64-none-linux-gnu/bin/ld: src.c:(.text+0x3c): undefined reference to `pthread_join'
collect2: error: ld returned 1 exit status
gmake[2]: *** [CMakeFiles/cmTC_dfe54.dir/build.make:99: cmTC_dfe54] Error 1
gmake[2]: Leaving directory '/tmp/instance-13/output-1/build/zeek-4.1.1/buildroot-build/libkqueue-build/CMakeFiles/CMakeTmp'
gmake[1]: *** [Makefile:127: cmTC_dfe54/fast] Error 2
gmake[1]: Leaving directory '/tmp/instance-13/output-1/build/zeek-4.1.1/buildroot-build/libkqueue-build/CMakeFiles/CMakeTmp'


Source file was:
#include <pthread.h>

static void* test_func(void* data)
{
  return data;
}

int main(void)
{
  pthread_t thread;
  pthread_create(&thread, NULL, test_func, NULL);
  pthread_detach(thread);
  pthread_cancel(thread);
  pthread_join(thread, NULL);
  pthread_atfork(NULL, NULL, NULL);
  pthread_exit(NULL);

  return 0;
}

Determining if the NOTE_TRUNCATE exist failed with the following output:
Change Dir: /tmp/instance-13/output-1/build/zeek-4.1.1/buildroot-build/libkqueue-build/CMakeFiles/CMakeTmp

Run Build Command(s):/usr/bin/gmake -f Makefile cmTC_4329b/fast && gmake[1]: Entering directory '/tmp/instance-13/output-1/build/zeek-4.1.1/buildroot-build/libkqueue-build/CMakeFiles/CMakeTmp'
/usr/bin/gmake  -f CMakeFiles/cmTC_4329b.dir/build.make CMakeFiles/cmTC_4329b.dir/build
gmake[2]: Entering directory '/tmp/instance-13/output-1/build/zeek-4.1.1/buildroot-build/libkqueue-build/CMakeFiles/CMakeTmp'
Building C object CMakeFiles/cmTC_4329b.dir/CheckSymbolExists.c.o
/tmp/instance-13/output-1/host/bin/aarch64-none-linux-gnu-gcc --sysroot=/tmp/instance-13/output-1/host/aarch64-buildroot-linux-gnu/sysroot   -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -Og -g0 -D_FORTIFY_SOURCE=2   -DNDEBUG -fPIE -o CMakeFiles/cmTC_4329b.dir/CheckSymbolExists.c.o -c /tmp/instance-13/output-1/build/zeek-4.1.1/buildroot-build/libkqueue-build/CMakeFiles/CMakeTmp/CheckSymbolExists.c
/tmp/instance-13/output-1/build/zeek-4.1.1/buildroot-build/libkqueue-build/CMakeFiles/CMakeTmp/CheckSymbolExists.c:2:10: fatal error: sys/event.h: No such file or directory
    2 | #include <sys/event.h>
      |          ^~~~~~~~~~~~~
compilation terminated.
gmake[2]: *** [CMakeFiles/cmTC_4329b.dir/build.make:78: CMakeFiles/cmTC_4329b.dir/CheckSymbolExists.c.o] Error 1
gmake[2]: Leaving directory '/tmp/instance-13/output-1/build/zeek-4.1.1/buildroot-build/libkqueue-build/CMakeFiles/CMakeTmp'
gmake[1]: *** [Makefile:127: cmTC_4329b/fast] Error 2
gmake[1]: Leaving directory '/tmp/instance-13/output-1/build/zeek-4.1.1/buildroot-build/libkqueue-build/CMakeFiles/CMakeTmp'


File /tmp/instance-13/output-1/build/zeek-4.1.1/buildroot-build/libkqueue-build/CMakeFiles/CMakeTmp/CheckSymbolExists.c:
/* */
#include <sys/event.h>

int main(int argc, char** argv)
{
  (void)argv;
#ifndef NOTE_TRUNCATE
  return ((int*)(&NOTE_TRUNCATE))[argc];
#else
  (void)argc;
  return 0;
#endif
}