Determining if the function pthread_create exists in the pthread passed with the following output:
Change Dir: /build/opendht-2.1.6/obj-x86_64-linux-gnu/CMakeFiles/CMakeTmp

Run Build Command(s):/usr/bin/gmake cmTC_d544a/fast && gmake[2]: Entering directory '/build/opendht-2.1.6/obj-x86_64-linux-gnu/CMakeFiles/CMakeTmp'
/usr/bin/gmake  -f CMakeFiles/cmTC_d544a.dir/build.make CMakeFiles/cmTC_d544a.dir/build
gmake[3]: Entering directory '/build/opendht-2.1.6/obj-x86_64-linux-gnu/CMakeFiles/CMakeTmp'
Building C object CMakeFiles/cmTC_d544a.dir/CheckFunctionExists.c.o
/usr/bin/cc   -g -O2 -fdebug-prefix-map=/build/opendht-2.1.6=. -fstack-protector-strong -Wformat -Werror=format-security -Wdate-time -D_FORTIFY_SOURCE=2 -DCHECK_FUNCTION_EXISTS=pthread_create -fPIE -o CMakeFiles/cmTC_d544a.dir/CheckFunctionExists.c.o -c /usr/share/cmake-3.18/Modules/CheckFunctionExists.c
Linking C executable cmTC_d544a
/usr/bin/cmake -E cmake_link_script CMakeFiles/cmTC_d544a.dir/link.txt --verbose=1
/usr/bin/cc -g -O2 -fdebug-prefix-map=/build/opendht-2.1.6=. -fstack-protector-strong -Wformat -Werror=format-security -Wdate-time -D_FORTIFY_SOURCE=2 -DCHECK_FUNCTION_EXISTS=pthread_create -Wl,-z,relro -Wl,-z,now  -rdynamic CMakeFiles/cmTC_d544a.dir/CheckFunctionExists.c.o -o cmTC_d544a  -lpthread 
gmake[3]: Leaving directory '/build/opendht-2.1.6/obj-x86_64-linux-gnu/CMakeFiles/CMakeTmp'
gmake[2]: Leaving directory '/build/opendht-2.1.6/obj-x86_64-linux-gnu/CMakeFiles/CMakeTmp'



	cd obj-x86_64-linux-gnu && tail -v -n \+0 CMakeFiles/CMakeError.log
==> CMakeFiles/CMakeError.log <==
Performing C SOURCE FILE Test CMAKE_HAVE_LIBC_PTHREAD failed with the following output:
Change Dir: /build/opendht-2.1.6/obj-x86_64-linux-gnu/CMakeFiles/CMakeTmp

Run Build Command(s):/usr/bin/gmake cmTC_8827b/fast && gmake[2]: Entering directory '/build/opendht-2.1.6/obj-x86_64-linux-gnu/CMakeFiles/CMakeTmp'
/usr/bin/gmake  -f CMakeFiles/cmTC_8827b.dir/build.make CMakeFiles/cmTC_8827b.dir/build
gmake[3]: Entering directory '/build/opendht-2.1.6/obj-x86_64-linux-gnu/CMakeFiles/CMakeTmp'
Building C object CMakeFiles/cmTC_8827b.dir/src.c.o
/usr/bin/cc   -g -O2 -fdebug-prefix-map=/build/opendht-2.1.6=. -fstack-protector-strong -Wformat -Werror=format-security -Wdate-time -D_FORTIFY_SOURCE=2 -DCMAKE_HAVE_LIBC_PTHREAD -fPIE -o CMakeFiles/cmTC_8827b.dir/src.c.o -c /build/opendht-2.1.6/obj-x86_64-linux-gnu/CMakeFiles/CMakeTmp/src.c
Linking C executable cmTC_8827b
/usr/bin/cmake -E cmake_link_script CMakeFiles/cmTC_8827b.dir/link.txt --verbose=1
/usr/bin/cc -g -O2 -fdebug-prefix-map=/build/opendht-2.1.6=. -fstack-protector-strong -Wformat -Werror=format-security -Wdate-time -D_FORTIFY_SOURCE=2 -DCMAKE_HAVE_LIBC_PTHREAD -Wl,-z,relro -Wl,-z,now  -rdynamic CMakeFiles/cmTC_8827b.dir/src.c.o -o cmTC_8827b 
/usr/bin/ld: CMakeFiles/cmTC_8827b.dir/src.c.o: in function `main':
./obj-x86_64-linux-gnu/CMakeFiles/CMakeTmp/./obj-x86_64-linux-gnu/CMakeFiles/CMakeTmp/src.c:11: undefined reference to `pthread_create'
/usr/bin/ld: ./obj-x86_64-linux-gnu/CMakeFiles/CMakeTmp/./obj-x86_64-linux-gnu/CMakeFiles/CMakeTmp/src.c:12: undefined reference to `pthread_detach'
/usr/bin/ld: ./obj-x86_64-linux-gnu/CMakeFiles/CMakeTmp/./obj-x86_64-linux-gnu/CMakeFiles/CMakeTmp/src.c:13: undefined reference to `pthread_cancel'
/usr/bin/ld: ./obj-x86_64-linux-gnu/CMakeFiles/CMakeTmp/./obj-x86_64-linux-gnu/CMakeFiles/CMakeTmp/src.c:14: undefined reference to `pthread_join'
collect2: error: ld returned 1 exit status
gmake[3]: *** [CMakeFiles/cmTC_8827b.dir/build.make:106: cmTC_8827b] Error 1
gmake[3]: Leaving directory '/build/opendht-2.1.6/obj-x86_64-linux-gnu/CMakeFiles/CMakeTmp'
gmake[2]: *** [Makefile:140: cmTC_8827b/fast] Error 2
gmake[2]: Leaving directory '/build/opendht-2.1.6/obj-x86_64-linux-gnu/CMakeFiles/CMakeTmp'


Source file was:
#include <pthread.h>

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 function pthread_create exists in the pthreads failed with the following output:
Change Dir: /build/opendht-2.1.6/obj-x86_64-linux-gnu/CMakeFiles/CMakeTmp

Run Build Command(s):/usr/bin/gmake cmTC_93970/fast && gmake[2]: Entering directory '/build/opendht-2.1.6/obj-x86_64-linux-gnu/CMakeFiles/CMakeTmp'
/usr/bin/gmake  -f CMakeFiles/cmTC_93970.dir/build.make CMakeFiles/cmTC_93970.dir/build
gmake[3]: Entering directory '/build/opendht-2.1.6/obj-x86_64-linux-gnu/CMakeFiles/CMakeTmp'
Building C object CMakeFiles/cmTC_93970.dir/CheckFunctionExists.c.o
/usr/bin/cc   -g -O2 -fdebug-prefix-map=/build/opendht-2.1.6=. -fstack-protector-strong -Wformat -Werror=format-security -Wdate-time -D_FORTIFY_SOURCE=2 -DCHECK_FUNCTION_EXISTS=pthread_create -fPIE -o CMakeFiles/cmTC_93970.dir/CheckFunctionExists.c.o -c /usr/share/cmake-3.18/Modules/CheckFunctionExists.c
Linking C executable cmTC_93970
/usr/bin/cmake -E cmake_link_script CMakeFiles/cmTC_93970.dir/link.txt --verbose=1
/usr/bin/cc -g -O2 -fdebug-prefix-map=/build/opendht-2.1.6=. -fstack-protector-strong -Wformat -Werror=format-security -Wdate-time -D_FORTIFY_SOURCE=2 -DCHECK_FUNCTION_EXISTS=pthread_create -Wl,-z,relro -Wl,-z,now  -rdynamic CMakeFiles/cmTC_93970.dir/CheckFunctionExists.c.o -o cmTC_93970  -lpthreads 
/usr/bin/ld: cannot find -lpthreads
collect2: error: ld returned 1 exit status
gmake[3]: *** [CMakeFiles/cmTC_93970.dir/build.make:106: cmTC_93970] Error 1
gmake[3]: Leaving directory '/build/opendht-2.1.6/obj-x86_64-linux-gnu/CMakeFiles/CMakeTmp'
gmake[2]: *** [Makefile:140: cmTC_93970/fast] Error 2
gmake[2]: Leaving directory '/build/opendht-2.1.6/obj-x86_64-linux-gnu/CMakeFiles/CMakeTmp'



dh_auto_configure: error: cd obj-x86_64-linux-gnu && cmake -DCMAKE_INSTALL_PREFIX=/usr -DCMAKE_BUILD_TYPE=None -DCMAKE_INSTALL_SYSCONFDIR=/etc -DCMAKE_INSTALL_LOCALSTATEDIR=/var -DCMAKE_EXPORT_NO_PACKAGE_REGISTRY=ON -DCMAKE_FIND_PACKAGE_NO_PACKAGE_REGISTRY=ON "-GUnix Makefiles" -DCMAKE_VERBOSE_MAKEFILE=ON -DCMAKE_INSTALL_LIBDIR=lib/x86_64-linux-gnu -DOPENDHT_STATIC=ON -DOPENDHT_SHARED=OFF -DCMAKE_POSITION_INDEPENDENT_CODE=ON -DOPENDHT_PROXY_SERVER=ON -DOPENDHT_PROXY_CLIENT=ON -DOPENDHT_PUSH_NOTIFICATIONS=ON .. returned exit code 1
make[1]: *** [debian/rules:20: override_dh_auto_configure] Error 25
make[1]: Leaving directory '/build/opendht-2.1.6'
make: *** [debian/rules:17: build] Error 2