Index: lib/CMakeLists.txt
===================================================================
--- lib/CMakeLists.txt
+++ lib/CMakeLists.txt
@@ -126,6 +126,26 @@
   # Required for standards-complaint wide character formatting functions
   # (e.g. `printfw`/`scanfw`)
   add_library_flags(iso_stdio_wide_specifiers)
+elseif(MINGW)
+  if (LIBCXX_USE_COMPILER_RT)
+    set(MINGW_RUNTIME ${LIBCXX_BUILTINS_LIBRARY})
+  else ()
+    set(MINGW_RUNTIME gcc_s gcc)
+  endif()
+  add_library_flags(mingw32)
+  add_library_flags(${MINGW_RUNTIME})
+  add_library_flags(moldname)
+  add_library_flags(mingwex)
+  add_library_flags(msvcrt)
+  add_library_flags(advapi32)
+  add_library_flags(shell32)
+  add_library_flags(user32)
+  add_library_flags(kernel32)
+  add_library_flags(mingw32)
+  add_library_flags(${MINGW_RUNTIME})
+  add_library_flags(moldname)
+  add_library_flags(mingwex)
+  add_library_flags(msvcrt)
 endif()
 
 if (LIBCXX_OSX_REEXPORT_SYSTEM_ABI_LIBRARY)