[Vala] Newbie need help

[wolfgang mauer kabelmail de]

I tried to make example with 

Using Ubuntu 18 compiling failed with 
valac -o TestSqlite -g --define=_DEBUG --gresources resource.xml application.vala main.vala --pkg gtk+-3.0 
--pkg glib-2.0 --pkg gobject-2.0 --pkg sqlite3 --pkg webkit2gtk-4.0 ./resource.c
 

                [GtkChild]
                WebKit.WebView _webview;


In file included from /usr/include/webkitgtk-4.0/webkit2/webkit2.h:54:0,/usr/include/webkitgtk-4.0/webkit2
                 from 
/home/wolfgang/Projekte/TestSqlite/application.vala.c:10:/WebKitJavascriptResult.h:28:10: fatal error: 
jsc/jsc.h: Datei oder Verzeichnis nicht gefunden

Is this not possible?

Wolfgang