Determining if the getpassphrase exist failed with the following output:
Change Dir: /tmp/instance-6/output-1/build/znc-1.8.2/CMakeFiles/CMakeTmp

Run Build Command(s):/usr/bin/gmake -f Makefile cmTC_48312/fast && gmake[1]: Entering directory '/tmp/instance-6/output-1/build/znc-1.8.2/CMakeFiles/CMakeTmp'
/usr/bin/gmake  -f CMakeFiles/cmTC_48312.dir/build.make CMakeFiles/cmTC_48312.dir/build
gmake[2]: Entering directory '/tmp/instance-6/output-1/build/znc-1.8.2/CMakeFiles/CMakeTmp'
Building CXX object CMakeFiles/cmTC_48312.dir/CheckSymbolExists.cxx.o
/tmp/instance-6/output-1/host/bin/aarch64_be-linux-g++ --sysroot=/tmp/instance-6/output-1/host/aarch64_be-buildroot-linux-gnu/sysroot   -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -Og -g0 -D_FORTIFY_SOURCE=2   -DNDEBUG -o CMakeFiles/cmTC_48312.dir/CheckSymbolExists.cxx.o -c /tmp/instance-6/output-1/build/znc-1.8.2/CMakeFiles/CMakeTmp/CheckSymbolExists.cxx
/tmp/instance-6/output-1/build/znc-1.8.2/CMakeFiles/CMakeTmp/CheckSymbolExists.cxx: In function 'int main(int, char**)':
/tmp/instance-6/output-1/build/znc-1.8.2/CMakeFiles/CMakeTmp/CheckSymbolExists.cxx:8:19: error: 'getpassphrase' was not declared in this scope
    8 |   return ((int*)(&getpassphrase))[argc];
      |                   ^~~~~~~~~~~~~
gmake[2]: *** [CMakeFiles/cmTC_48312.dir/build.make:78: CMakeFiles/cmTC_48312.dir/CheckSymbolExists.cxx.o] Error 1
gmake[2]: Leaving directory '/tmp/instance-6/output-1/build/znc-1.8.2/CMakeFiles/CMakeTmp'
gmake[1]: *** [Makefile:127: cmTC_48312/fast] Error 2
gmake[1]: Leaving directory '/tmp/instance-6/output-1/build/znc-1.8.2/CMakeFiles/CMakeTmp'


File /tmp/instance-6/output-1/build/znc-1.8.2/CMakeFiles/CMakeTmp/CheckSymbolExists.cxx:
/* */
#include <stdlib.h>

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