Created attachment 495780 [details]
app-misc/sphinx-2.2.11 fails to build with libtool 2.4.6-r3.
Build completes successfully with libtool 2.4.6-r4, so not a major issue, just reporting it here for reference.
Build log attached.
Sorry, I should mention:
libtool 2.4.6-r4 is masked, so this package currently fails to build as shipped.
I can't reproduce this with sphinx 2.2.11 and libtool-2.4.6-r3.