File 3013-riscv64-link-pthread.patch of Package ceph-ceph-15.2.17

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 0d1cf4e78a3..e09b5d80da2 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -30,6 +30,7 @@ if(NOT CMAKE_BUILD_TYPE AND EXISTS "${CMAKE_SOURCE_DIR}/.git")
 endif()
 
   set(LINUX ON)
+  set(THREADS_PREFER_PTHREAD_FLAG ON)
   FIND_PACKAGE(Threads)
 elseif(CMAKE_SYSTEM_NAME MATCHES "FreeBSD")
   set(FREEBSD ON)