build failures with 0.2.6 release about waylandpp HOT 5 CLOSED

...
        -DCMAKE_BUILD_TYPE=RelWithDebInfo \\\
        -DCMAKE_C_FLAGS="${CFLAGS:-%optflags} -DNDEBUG" \\\
        -DCMAKE_CXX_FLAGS="${CXXFLAGS:-%optflags} -DNDEBUG" \\\
        -DCMAKE_Fortran_FLAGS="${FFLAGS:-%optflags%{?_fmoddir: -I%_fmoddir}} -DNDEBUG" \\\
        -DCMAKE_EXE_LINKER_FLAGS="-Wl,--as-needed -Wl,--no-undefined -Wl,-z,now" \\\
        -DCMAKE_MODULE_LINKER_FLAGS="-Wl,--as-needed" \\\
        -DCMAKE_SHARED_LINKER_FLAGS="-Wl,--as-needed -Wl,--no-undefined -Wl,-z,now" \\\
...

Performing C SOURCE FILE Test CMAKE_HAVE_LIBC_PTHREAD failed with the following output:
Change Dir: /home/neal/git/kodi-git/src/xbmc/CMakeFiles/CMakeTmp

Run Build Command(s):/usr/bin/make cmTC_f7da0/fast && /usr/bin/make -f CMakeFiles/cmTC_f7da0.dir/build.make CMakeFiles/cmTC_f7da0.dir/build
make[1]: Entering directory '/home/neal/git/kodi-git/src/xbmc/CMakeFiles/CMakeTmp'
Building C object CMakeFiles/cmTC_f7da0.dir/src.c.o
/usr/lib/ccache/bin/cc   -march=native -O2 -pipe -fstack-protector-strong -fno-plt -DWL_EGL_PLATFORM=1 -DPLATFORM_SETTINGS_FILE=wayland.xml -Wall -DCMAKE_HAVE_LIBC_PTHREAD   -o CMakeFiles/cmTC_f7da0.dir/src.c.o   -c /home/neal/git/kodi-git/src/xbmc/CMakeFiles/CMakeTmp/src.c
Linking C executable cmTC_f7da0
/usr/bin/cmake -E cmake_link_script CMakeFiles/cmTC_f7da0.dir/link.txt --verbose=1
/usr/lib/ccache/bin/cc -march=native -O2 -pipe -fstack-protector-strong -fno-plt -DWL_EGL_PLATFORM=1 -DPLATFORM_SETTINGS_FILE=wayland.xml -Wall -DCMAKE_HAVE_LIBC_PTHREAD  -Wl,-O1,--sort-common,--as-needed,-z,relro,-z,now -fuse-ld=gold  CMakeFiles/cmTC_f7da0.dir/src.c.o  -o cmTC_f7da0 
CMakeFiles/cmTC_f7da0.dir/src.c.o:src.c:function main: error: undefined reference to 'pthread_create'
CMakeFiles/cmTC_f7da0.dir/src.c.o:src.c:function main: error: undefined reference to 'pthread_detach'
CMakeFiles/cmTC_f7da0.dir/src.c.o:src.c:function main: error: undefined reference to 'pthread_join'
collect2: error: ld returned 1 exit status
make[1]: *** [CMakeFiles/cmTC_f7da0.dir/build.make:87: cmTC_f7da0] Error 1
make[1]: Leaving directory '/home/neal/git/kodi-git/src/xbmc/CMakeFiles/CMakeTmp'
make: *** [Makefile:121: cmTC_f7da0/fast] Error 2


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_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: /home/neal/git/kodi-git/src/xbmc/CMakeFiles/CMakeTmp

Run Build Command(s):/usr/bin/make cmTC_c1eb5/fast && /usr/bin/make -f CMakeFiles/cmTC_c1eb5.dir/build.make CMakeFiles/cmTC_c1eb5.dir/build
make[1]: Entering directory '/home/neal/git/kodi-git/src/xbmc/CMakeFiles/CMakeTmp'
Building C object CMakeFiles/cmTC_c1eb5.dir/CheckFunctionExists.c.o
/usr/lib/ccache/bin/cc   -march=native -O2 -pipe -fstack-protector-strong -fno-plt -DWL_EGL_PLATFORM=1 -DPLATFORM_SETTINGS_FILE=wayland.xml -Wall -DCHECK_FUNCTION_EXISTS=pthread_create   -o CMakeFiles/cmTC_c1eb5.dir/CheckFunctionExists.c.o   -c /usr/share/cmake-3.15/Modules/CheckFunctionExists.c
Linking C executable cmTC_c1eb5
/usr/bin/cmake -E cmake_link_script CMakeFiles/cmTC_c1eb5.dir/link.txt --verbose=1
/usr/lib/ccache/bin/cc -march=native -O2 -pipe -fstack-protector-strong -fno-plt -DWL_EGL_PLATFORM=1 -DPLATFORM_SETTINGS_FILE=wayland.xml -Wall -DCHECK_FUNCTION_EXISTS=pthread_create  -Wl,-O1,--sort-common,--as-needed,-z,relro,-z,now -fuse-ld=gold  CMakeFiles/cmTC_c1eb5.dir/CheckFunctionExists.c.o  -o cmTC_c1eb5 -lpthreads 
/usr/bin/ld.gold: error: cannot find -lpthreads
CMakeFiles/cmTC_c1eb5.dir/CheckFunctionExists.c.o:CheckFunctionExists.c:function main: error: undefined reference to 'pthread_create'
collect2: error: ld returned 1 exit status
make[1]: *** [CMakeFiles/cmTC_c1eb5.dir/build.make:87: cmTC_c1eb5] Error 1
make[1]: Leaving directory '/home/neal/git/kodi-git/src/xbmc/CMakeFiles/CMakeTmp'
make: *** [Makefile:121: cmTC_c1eb5/fast] Error 2