Index: libaom-9999/CMakeLists.txt
===================================================================
--- libaom-9999.orig/CMakeLists.txt
+++ libaom-9999/CMakeLists.txt
@@ -575,6 +575,9 @@
   include("${AOM_ROOT}/build/cmake/exports.cmake")
   setup_exports_target()
   set_target_properties(aom PROPERTIES SOVERSION 0)
+  if(HAVE_PTHREAD_H AND CONFIG_MULTITHREAD)
+    target_link_libraries(aom ${AOM_LIB_LINK_TYPE} Threads::Threads)
+  endif()
 endif()
 
 # Handle user supplied compile and link flags last to ensure they're obeyed.