Index: lib/CMakeLists.txt
===================================================================
--- lib/CMakeLists.txt
+++ lib/CMakeLists.txt
@@ -272,6 +272,8 @@
       "$<TARGET_LINKER_FILE:cxx_static>"
       "${MERGE_ARCHIVES_ABI_TARGET}"
       "${MERGE_ARCHIVES_SEARCH_PATHS}"
+    COMMAND
+      ${CMAKE_RANLIB} $<TARGET_LINKER_FILE:cxx_static>
     WORKING_DIRECTORY ${LIBCXX_BUILD_DIR}
     )
   endif()