I get these warnings in ncurses' lib32* packages:
,----
| W: lib32ncurses6: lacks-unversioned-link-to-shared-library example: usr/lib32/libform.so [usr/lib32/libform.so.6.3]
| W: lib32ncurses6: lacks-unversioned-link-to-shared-library example: usr/lib32/libmenu.so [usr/lib32/libmenu.so.6.3]
| W: lib32ncurses6: lacks-unversioned-link-to-shared-library example: usr/lib32/libncurses.so [lib32/libncurses.so.6.3]
| W: lib32ncurses6: lacks-unversioned-link-to-shared-library example: usr/lib32/libpanel.so [usr/lib32/libpanel.so.6.3]
| W: lib32ncursesw6: lacks-unversioned-link-to-shared-library example: usr/lib32/libformw.so [usr/lib32/libformw.so.6.3]
| W: lib32ncursesw6: lacks-unversioned-link-to-shared-library example: usr/lib32/libmenuw.so [usr/lib32/libmenuw.so.6.3]
| W: lib32ncursesw6: lacks-unversioned-link-to-shared-library example: usr/lib32/libncursesw.so [lib32/libncursesw.so.6.3]
| W: lib32ncursesw6: lacks-unversioned-link-to-shared-library example: usr/lib32/libpanelw.so [usr/lib32/libpanelw.so.6.3]
| W: lib32tinfo6: lacks-unversioned-link-to-shared-library example: usr/lib32/libtic.so [usr/lib32/libtic.so.6.3]
| W: lib32tinfo6: lacks-unversioned-link-to-shared-library example: usr/lib32/libtinfo.so [lib32/libtinfo.so.6.3]
`----
All those symlinks exist in the lib32ncurses-dev package.