There's a tricky conflict in the ncurses package definition between
master and core-updates.

On core-updates, there is 57742b35dc026 (gnu: ncurses: Install
pkg-config ‘.pc’ files.), and on master, it's d230cf61f6a (gnu: ncurses:
support mingw.).

The mingw commit added some conditionals relating to mingw, and I'm not
sure if the pkg-config change should be applied for mingw builds or not.

Can you give me advice about how to resolve this, or merge master into
core-updates yourself?  There are a few other conflicts, but they are
easy to resolve.