- Define symbol in curses.h which controls whether some library
- structures are treated as "opaque". The --enable-opaque-curses option
- is overridden by the --enable-reentrant option.
+ Define symbol in curses.h controlling whether some library structures
+ are opaque, meaning that their members are accessible only via the
+ documented API. The --enable-opaque-curses option may be overridden
+ by the --enable-reentrant option.
+
+ Enabling opaque-curses enables opaque for the form, menu, and panel
+ libraries. Use their corresponding options to disable the feature
+ individually.
+
+ NOTE: beginning with ncurses 6.5 this option is enabled by default;
+ older versions disable it by default.