AUVAL error with Xcode 4.5.2 and 10.6

On my 10.8 mac auval validates, but when trying the plugin on my 10.6.8 mac mini I get the next error:

aufx EMpT ERSY - Empty Room Systems: EMpTy250
2013-02-17 22:29:40.492 auvaltool[421:a07] Error loading /Users/harriemunnik/Library/Audio/Plug-Ins/Components/EMpTy250.component/Contents/MacOS/EMpTy250: dlopen(/Users/harriemunnik/Library/Audio/Plug-Ins/Components/EMpTy250.component/Contents/MacOS/EMpTy250, 262): Library not loaded: /System/Library/Frameworks/CoreText.framework/Versions/A/CoreText
Referenced from: /Users/harriemunnik/Library/Audio/Plug-Ins/Components/EMpTy250.component/Contents/MacOS/EMpTy250
Reason: image not found
Cannot open component: -50

Looks like I have to add Coretext.framework. I tried that but that did not help. Any other ideas?

I tried the disabling of coretext in Appconfig.h (JUCE_CORETEXT_AVAILABLE 0) and now I get the next AUVAL-error in 10.6:

[code]2013-02-21 21:38:06.283 auvaltool[3668:a07] Error loading /Users/harriemunnik/Library/Audio/Plug-Ins/Components/EMpTy250.component/Contents/MacOS/EMpTy250: dlopen(/Users/harriemunnik/Library/Audio/Plug-Ins/Components/EMpTy250.component/Contents/MacOS/EMpTy250, 262): Library not loaded: /System/Library/Frameworks/ImageIO.framework/Versions/A/ImageIO
Referenced from: /Users/harriemunnik/Library/Audio/Plug-Ins/Components/EMpTy250.component/Contents/MacOS/EMpTy250
/code]

Should I use an older version of this lib?

Hmmm, I used the quick and dirty trick by building a version for 10.6 with my 3.2.6 Xcode. I would rather like to build it on one place, like the rest of the versions. Apple made a mess out of the backward compatibility.