I updated my svn earlier today and Xcode 2.5 failed to build Adium on my Mac Mini G4 running OS X 10.4.11.
cd "/Users/robertvehse/adium/Frameworks/JSON Framework"
/Developer/usr/bin/gcc-4.0 -x objective-c -arch ppc -pipe -std=gnu99 -Wno-trigraphs -fpascal-strings -fasm-blocks -g -O0 -fmessage-length=0 -mtune=G5 -mfix-and-continue -mmacosx-version-min=10.4 -I/Users/robertvehse/adium/Frameworks/JSON\ Framework/../../build/JSON.build/Development/JSON.build/JSON.hmap -F/Users/robertvehse/adium/Frameworks/JSON\ Framework/../../build/Development -I/Users/robertvehse/adium/Frameworks/JSON\ Framework/../../build/Development/include -I/Users/robertvehse/adium/Frameworks/JSON\ Framework/../../build/JSON.build/Development/JSON.build/DerivedSources -isysroot /Developer/SDKs/MacOSX10.4u.sdk -include /Library/Caches/com.apple.Xcode.501/SharedPrecompiledHeaders/Foundation-bxdsyljdyxsrybdhrpnxcmharxcm/Foundation.h -c /Users/robertvehse/adium/Frameworks/JSON\ Framework/Source/NSObject+SBJSON.m -o /Users/robertvehse/adium/Frameworks/JSON\ Framework/../../build/JSON.build/Development/JSON.build/Objects-normal/ppc/NSObject+SBJSON.o
/Users/robertvehse/adium/Frameworks/JSON Framework/Source/NSObject+SBJSON.m: In function '-[NSArray(NSArray_SBJSON) JSONFragmentWithOptions:into:]':
/Users/robertvehse/adium/Frameworks/JSON Framework/Source/NSObject+SBJSON.m:176: error: nested functions are disabled, use -fnested-functions to re-enable
/Users/robertvehse/adium/Frameworks/JSON Framework/Source/NSObject+SBJSON.m:176: error: syntax error before 'in'
/Users/robertvehse/adium/Frameworks/JSON Framework/Source/NSObject+SBJSON.m:180: error: 'item' undeclared (first use in this function)
/Users/robertvehse/adium/Frameworks/JSON Framework/Source/NSObject+SBJSON.m:180: error: (Each undeclared identifier is reported only once
/Users/robertvehse/adium/Frameworks/JSON Framework/Source/NSObject+SBJSON.m:180: error: for each function it appears in.)
/Users/robertvehse/adium/Frameworks/JSON Framework/Source/NSObject+SBJSON.m: At top level:
/Users/robertvehse/adium/Frameworks/JSON Framework/Source/NSObject+SBJSON.m:182: error: parse error before '->' token
/Users/robertvehse/adium/Frameworks/JSON Framework/Source/NSObject+SBJSON.m: In function '-[NSDictionary(NSDictionary_SBJSON) JSONFragmentWithOptions:into:]':
/Users/robertvehse/adium/Frameworks/JSON Framework/Source/NSObject+SBJSON.m:227: error: nested functions are disabled, use -fnested-functions to re-enable
/Users/robertvehse/adium/Frameworks/JSON Framework/Source/NSObject+SBJSON.m:227: error: syntax error before 'in'
/Users/robertvehse/adium/Frameworks/JSON Framework/Source/NSObject+SBJSON.m:231: error: 'key' undeclared (first use in this function)
/Users/robertvehse/adium/Frameworks/JSON Framework/Source/NSObject+SBJSON.m: At top level:
/Users/robertvehse/adium/Frameworks/JSON Framework/Source/NSObject+SBJSON.m:240: error: parse error before '->' token
Build failed (8 errors, 7 warnings)