https://bugs.gentoo.org/944986
https://github.com/themoken/canto-curses/issues/59
https://gitlab.archlinux.org/archlinux/packaging/packages/canto-curses/-/blob/bc6f6a6e2668798643431a2d3daa41feabb4600a/fix-build.patch

--- canto-curses-0.9.9.orig/canto_curses/widecurse.c
+++ canto-curses-0.9.9/canto_curses/widecurse.c
@@ -6,9 +6,12 @@
    published by the Free Software Foundation.
 */
 
+#define NCURSES_INTERNALS 1
 #include <Python.h>
+#include <curses.h>
 #include <py_curses.h>
 #include <readline/readline.h>
+#include <wchar.h>
 
 static PyObject *py_wcwidth(PyObject * self, PyObject * args)
 {