Index: cmake/modules/LLDBConfig.cmake
===================================================================
--- cmake/modules/LLDBConfig.cmake
+++ cmake/modules/LLDBConfig.cmake
@@ -346,14 +346,14 @@
 
 endif()
 
-if (HAVE_LIBPTHREAD)
-  list(APPEND system_libs pthread)
-endif(HAVE_LIBPTHREAD)
-
-if (HAVE_LIBDL)
-  list(APPEND system_libs ${CMAKE_DL_LIBS})
+if(UNIX)
+  set(CMAKE_THREAD_PREFER_PTHREAD TRUE)
+  find_package(Threads REQUIRED)
+  list(APPEND system_libs ${CMAKE_THREAD_LIBS_INIT})
 endif()
 
+list(APPEND system_libs ${CMAKE_DL_LIBS})
+
 # Figure out if lldb could use lldb-server.  If so, then we'll
 # ensure we build lldb-server when an lldb target is being built.
 if (CMAKE_SYSTEM_NAME MATCHES "Android|Darwin|FreeBSD|Linux|NetBSD")