It occurred to me that Huub wrote in gmane.os.netbsd.ports.x86-64:
> Removed the pkgsrc/ directory, untarred the pkgsrc2006Q2 again,

So, you moved from current to 2006Q2, back to current, now to 2006Q2 and you
still expect things to work? :)

> and build fluxbox (wm/), links (www/), emacs (editors/), gimp (graphics/),
> scilab (math/) and gnuplot (graphics/). All without problems. Then, 
> building firefox stops after building the depedancies and returning to 
> building firefox: C compiler cannot create executables

Full error please. Considering your flipping back-and-forth between pkgsrc
versions, are your packages up to date? What does lintpkgsrc -i say?

-- 
    Martijn van Buul - pino@dohd.org - http://www.stack.nl/~martijnb/
	 Geek code: G--  - Visit OuterSpace: mud.stack.nl 3333
 The most exciting phrase to hear in science, the one that heralds new
discoveries, is not 'Eureka!' (I found it!) but 'That's funny ...' Isaac Asimov