I try to compile latest cvs tear version from garage.
First problem was
error: libpcre not found in specified Vala API directories
error: conic not found in specified Vala API directories
error: gdk-keysyms not found in specified Vala API directories
I just copied
cp vapis/libpcre.vapi vapis/conic.vapi vapis/gdk-keysyms.vapi /usr/share/vala/vapi/

Then
downloadmanager.vala:179.34-179.51: error: The type name `WebKit.WebDownload' could not be found
downloadmanager.vala:189.26-189.43: error: The type name `WebKit.WebDownload' could not be found
downloadmanager.vala:197.27-197.44: error: The type name `WebKit.WebDownload' could not be found
downloadmanager.vala:209.24-209.41: error: The type name `WebKit.WebDownload' could not be found
downloadmanager.vala:209.61-209.83: error: The type name `WebKit.WebDownloadError' could not be found

I use http://bundyo.org/maemo/webkit/libwe...1137-8_all.deb