Determining if the function pthread_create exists in the pthreads failed with the following output:
Change Dir: /home/buildroot/autobuild/instance-0/output-1/build/hackrf-2022.09.1/host/CMakeFiles/CMakeTmp

Run Build Command(s):/usr/bin/make -f Makefile cmTC_d7e3d/fast && make[1]: Entering directory '/home/buildroot/autobuild/instance-0/output-1/build/hackrf-2022.09.1/host/CMakeFiles/CMakeTmp'
/usr/bin/make  -f CMakeFiles/cmTC_d7e3d.dir/build.make CMakeFiles/cmTC_d7e3d.dir/build
make[2]: Entering directory '/home/buildroot/autobuild/instance-0/output-1/build/hackrf-2022.09.1/host/CMakeFiles/CMakeTmp'
Building C object CMakeFiles/cmTC_d7e3d.dir/CheckFunctionExists.c.o
/home/buildroot/autobuild/instance-0/output-1/host/bin/or1k-buildroot-linux-uclibc-gcc --sysroot=/home/buildroot/autobuild/instance-0/output-1/host/or1k-buildroot-linux-uclibc/sysroot   -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -Ofast -g0 -std=gnu90 -DCHECK_FUNCTION_EXISTS=pthread_create  -DNDEBUG -o CMakeFiles/cmTC_d7e3d.dir/CheckFunctionExists.c.o -c /home/buildroot/autobuild/instance-0/output-1/host/share/cmake-3.22/Modules/CheckFunctionExists.c
Linking C executable cmTC_d7e3d
/home/buildroot/autobuild/instance-0/output-1/host/bin/cmake -E cmake_link_script CMakeFiles/cmTC_d7e3d.dir/link.txt --verbose=1
/home/buildroot/autobuild/instance-0/output-1/host/bin/or1k-buildroot-linux-uclibc-gcc --sysroot=/home/buildroot/autobuild/instance-0/output-1/host/or1k-buildroot-linux-uclibc/sysroot -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -Ofast -g0 -std=gnu90 -DCHECK_FUNCTION_EXISTS=pthread_create  -DNDEBUG CMakeFiles/cmTC_d7e3d.dir/CheckFunctionExists.c.o -o cmTC_d7e3d  -lpthreads 
/home/buildroot/autobuild/instance-0/output-1/host/lib/gcc/or1k-buildroot-linux-uclibc/10.4.0/../../../../or1k-buildroot-linux-uclibc/bin/ld: cannot find -lpthreads: No such file or directory
collect2: error: ld returned 1 exit status
CMakeFiles/cmTC_d7e3d.dir/build.make:98: recipe for target 'cmTC_d7e3d' failed
make[2]: *** [cmTC_d7e3d] Error 1
make[2]: Leaving directory '/home/buildroot/autobuild/instance-0/output-1/build/hackrf-2022.09.1/host/CMakeFiles/CMakeTmp'
Makefile:127: recipe for target 'cmTC_d7e3d/fast' failed
make[1]: *** [cmTC_d7e3d/fast] Error 2
make[1]: Leaving directory '/home/buildroot/autobuild/instance-0/output-1/build/hackrf-2022.09.1/host/CMakeFiles/CMakeTmp'