Comment # 2 on bug 1039391 from Dr. Werner Fink

The struct TERMTYPE is and was an internal type and now it becomes protected

#ifdef NCURSES_INTERNALS
typedef TERMTYPE TERMTYPE2;

typedef struct term {           /* describe an actual terminal */
    TERMTYPE    type;           /* terminal type description */
    short       Filedes;        /* file description being written to */
    TTY         Ottyb;          /* original state of the terminal */
    TTY         Nttyb;          /* current state of the terminal */
    int         _baudrate;      /* used to compute padding */
    char *      _termname;      /* used for termname() */
} TERMINAL;
#else
typedef struct term TERMINAL;
#endif /* NCURSES_INTERNALS */

... maybe

AC_CHECK_HEADERS(term.h ncurses/term.h curses/term.h)

could be an option as long as wyrd does not use internals like TERMINAL