Firefox build problem: GetVisibility__C7nsIView undefined (Linux/PPC)

I just built Firefox 1.0.7 for PPC/Linux, and the build was
successful, but when I try to start it up, I get:

	/usr/local/lib/firefox-1.0.7/firefox-bin: error while loading shared libraries:
	/usr/local/lib/firefox-1.0.7/components/libdocshell.so: undefined symbol: GetVisibility__C7nsIView

I can see that the symbol is (weakly) defined in libgklayout.so:

	$ nm libgklayout.so | grep GetVisibility__C7nsIView
	00c50f9c W GetVisibility__C7nsIView

This was (I thought) a perfectly straightforward build, analogous
to the one I did for 1.0.1 or so and had no problems with.
The only thing I did differently this time, I think, was to add 
"ac_add_options --disable-tests" to my .mozconfig file.  (Perhaps
I'll try it again without that, but at two hours per build, idle
experimentation is forbidding.)

Any suggestions?
-- 
					Steve Summit
					[email protected]