-All of these interfaces are provided as macros and functions.
-The macros are suppressed (and only the functions provided)
-when \fBNCURSES_OPAQUE\fP is defined.
-The standard forms such as \fBgetyx\fP must be implemented as macros,
-and (in this implementation) are defined in terms of the functions
-described here,
-to avoid reliance on internal details of the WINDOW structure.
+All of these interfaces are implemented as macros and functions.
+The macros are suppressed
+(and only the functions provided)
+in an \*(``opaque\*(''
+.I \%ncurses
+build,
+which defines the preprocessor symbol
+.BR \%NCURSES_OPAQUE .
+See section \*(``ALTERNATE CONFIGURATIONS\*('' in \fB\%ncurses\fP(3X).
+.PP
+The standard forms such as \fB\%getyx\fP
+.I must
+be implemented as macros,
+and
+(in this implementation)
+are defined in terms of the functions described here,
+to avoid reliance on internal details of the \fI\%WINDOW\fP structure.