Re: No pthread on s390x?

This error only happens on s390x... -- Looking for pthread.h -- Looking for pthread.h - found -- Performing Test CMAKE_HAVE_LIBC_PTHREAD -- Performing Test CMAKE_HAVE_LIBC_PTHREAD - Failed -- Looking for pthread_create in pthreads -- Looking for pthread_create in pthreads - not found -- Looking for pthread_create in pthread -- Looking for pthread_create in pthread - not found -- Check if compiler accepts -pthread -- Check if compiler accepts -pthread - no CMake Error at /usr/share/cmake/Modules/FindPackageHandleStandardArgs.cmake:146 (message): Could NOT find Threads (missing: Threads_FOUND) Call Stack (most recent call first): /usr/share/cmake/Modules/FindPackageHandleStandardArgs.cmake:393 (_FPHSA_FAILURE_MESSAGE) /usr/share/cmake/Modules/FindThreads.cmake:220 (FIND_PACKAGE_HANDLE_STANDARD_ARGS) /usr/lib64/cmake/Qt5UiTools/Qt5UiToolsConfig.cmake:73 (find_package) /usr/lib64/cmake/Qt5UiTools/Qt5UiToolsConfig.cmake:233 (_qt5_UiTools_process_prl_file) sources/cmake_helpers/helpers.cmake:21 (find_package) sources/pyside2/CMakeLists.txt:159 (collect_optional_modules) -- Configuring incomplete, errors occurred! https://koji.fedoraproject.org/koji/taskinfo?taskID=39567395 On other platforms the last check succeeds. I've never run into this before. Ideas?