emacs-28 fails xwidget make

[Colin Baxter]

Hello,

I've tried to build a fresh git pull of emacs with the xwidget option:

./configure  --with-xwidgets

There were no configure errors. In particular, I got the line

"Does Emacs support Xwidgets?     yes"

However on make, at the line "CC  xwidget.o" I get the error:

xwidget.c:335:20: error: unknown type name ‘JSCValue’
 webkit_js_to_lisp (JSCValue *value)
                    ^~~~~~~~
xwidget.c: In function ‘webkit_javascript_finished_cb’:
xwidget.c:428:7: error: unknown type name ‘JSCValue’
       JSCValue *value = webkit_javascript_result_get_js_value
 (js_result);

etc. etc.

Without the xwidgets option, emacs build satisfactorily. My system is
Linux 4.9.0-14-686-pae #1 SMP Debian 4.9.240-2 (2020-10-30) i686
GNU/Linux..

Colin Baxter.