webkit fails to build

[Patrick Welche <prlw1%cam.ac.uk@localhost>]

I just got

  CXX    Source/WebCore/xml/libWebCore_la-XPathParser.lo
Source/WebCore/xml/XPathParser.cpp: In member function 
'WebCore::XPath::Expression* WebCore::XPath::Parser::parseStatement(const 
WTF::String&, WTF::PassRefPtr<WebCore::XPathNSResolver>, 
WebCore::ExceptionCode&)':
Source/WebCore/xml/XPathParser.cpp:478:39: error: too many arguments to 
function 'int WebCore::XPath::xpathyyparse()'
./DerivedSources/WebCore/XPathGrammar.hpp:108:5: note: declared here
gmake[1]: *** [Source/WebCore/xml/libWebCore_la-XPathParser.lo] Error 1
gmake[1]: Leaving directory `/usr/pkgsrc/www/webkit-gtk3/work.x86_64/webkit-1.8.

in www/webkit-gtk3 (probably would also get it in webkit-gtk)

It seems to be because of the bison upgrade to 2.6, according to

https://bugs.webkit.org/show_bug.cgi?id=92264


Cheers,

Patrick