Index: tools/lldb-mi/CMakeLists.txt
===================================================================
--- tools/lldb-mi/CMakeLists.txt
+++ tools/lldb-mi/CMakeLists.txt
@@ -7,6 +7,10 @@
   list(APPEND extra_libs pthread)
 endif ()
 
+if(CMAKE_SYSTEM_NAME MATCHES "Windows")
+  list(APPEND extra_libs User32)
+endif()
+
 # We need to include the llvm components we depend on manually, as liblldb does
 # not re-export those.
 set(LLVM_LINK_COMPONENTS Support)