See first bug 449283 comment 25. After I applied Neil's patch I am still not able to build. Performed full clobbered build on a very fresh trunk: link -NOLOGO -DLL -OUT:layers.dll -PDB:layers.pdb -SUBSYSTEM:WINDOWS BasicImages.obj BasicLayers.obj LayerManagerOGL.obj ThebesLayerOGL.obj ContainerLayerOGL.obj ImageLayerOGL.obj ./module.res -NXCOMPAT -DYNAMICBASE -SAFESEH -DEBUG -DEBUGTYPE:CV ../../dist/lib/gkgfx.lib ../../dist/lib/thebes.lib ../../dist/lib/ycbcr.lib ../../gfx/cairo/cairo/src/mozcairo.lib ../../gfx/cairo/libpixmanzlibpixman.lib d:/mozilla/mozilla-central/_obj-browser-debug/dist/lib/xpcom.libd:/mozilla/mozilla-central/_obj-browser-debug/dist/lib/xpcom_core.lib d:/mozilla/mozilla-central/_obj-browser-debug/dist/lib/mozalloc.lib d:/mozilla/mozilla-central/_obj-browser-debug/dist/lib/nspr4.lib d:/mozilla/mozilla-central/_obj-browser-debug/dist/lib/plc4.lib d:/mozilla/mozilla-central/_obj-browser-debug/dist/lib/plds4.lib kernel32.lib user32.lib gdi32.lib winmm.lib wsock32.lib advapi32.lib Creating library layers.lib and object layers.exp LayerManagerOGL.obj : error LNK2001: unresolved external symbol "class mozilla::gl::GLContextProvider mozilla::gl::sGLContextProvider" (?sGLContextProvider@gl@mozilla@@3VGLContextProvider@12@A) layers.dll : fatal error LNK1120: 1 unresolved externals make[5]: *** [layers.dll] Error 96 make[5]: Leaving directory `/d/mozilla/mozilla-central/_obj-browser-debug/gfx/layers' make[4]: *** [libs] Error 2 make[4]: Leaving directory `/d/mozilla/mozilla-central/_obj-browser-debug/gfx' make[3]: *** [libs_tier_platform] Error 2 make[3]: Leaving directory `/d/mozilla/mozilla-central/_obj-browser-debug' make[2]: *** [tier_platform] Error 2 make[2]: Leaving directory `/d/mozilla/mozilla-central/_obj-browser-debug' make[1]: *** [default] Error 2 make[1]: Leaving directory `/d/mozilla/mozilla-central/_obj-browser-debug' make: *** [build] Error 2

I've posted a fix on bug 560147.

Bas, thanks, I can confirm this fixes the build problem for me.

Should be fixed with http://hg.mozilla.org/mozilla-central/rev/5d011d796c84.