Hi, I'm building a framework project using Xcode 4.6 configured to use the Apple GCC 4.2 compiler (my project also uses wxWidgets, so this compiler is required). Using Boost 1.55.0 I get: cd /Users/tim/Developer/RBSpeech setenv LANG en_US.US-ASCII /Applications/Xcode.app/Contents/Developer/usr/bin/llvm-gcc-4.2 -x objective-c++ -arch x86_64 -fmessage-length=0 -pipe -Wno-trigraphs -fpascal-strings -O0 -Wreturn-type -Wunused-variable -Wuninitialized -Wshorten-64-to-32 -DDEBUG=1 -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Develop er/SDKs/MacOSX10.8.sdk -fasm-blocks -mmacosx-version-min=10.6 -gdwarf-2 -fvisibility-inlines-hidden -iquote /Users/tim/Library/Developer/Xcode/DerivedData/RBSpeech-gglcnsigefizlfbidkwh bsxvlwng/Build/Intermediates/RBSpeech.build/Debug/RBSpeech.build/RBSpeech-ge nerated-files.hmap -I/Users/tim/Library/Developer/Xcode/DerivedData/RBSpeech-gglcnsigefizlfbidk whbsxvlwng/Build/Intermediates/RBSpeech.build/Debug/RBSpeech.build/RBSpeech- own-target-headers.hmap -I/Users/tim/Library/Developer/Xcode/DerivedData/RBSpeech-gglcnsigefizlfbidk whbsxvlwng/Build/Intermediates/RBSpeech.build/Debug/RBSpeech.build/RBSpeech- all-target-headers.hmap -iquote /Users/tim/Library/Developer/Xcode/DerivedData/RBSpeech-gglcnsigefizlfbidkwh bsxvlwng/Build/Intermediates/RBSpeech.build/Debug/RBSpeech.build/RBSpeech-pr oject-headers.hmap -I/Users/tim/Library/Developer/Xcode/DerivedData/RBSpeech-gglcnsigefizlfbidk whbsxvlwng/Build/Products/Debug/include -I/users/tim/developer/libraries/wxwidgets/include -I/users/tim/developer/libraries/cryptopp -I/users/tim/developer/libraries/boost_1_55_0 -I/users/tim/developer/sources/surfacereader -I/Users/tim/Library/Developer/Xcode/DerivedData/RBSpeech-gglcnsigefizlfbidk whbsxvlwng/Build/Intermediates/RBSpeech.build/Debug/RBSpeech.build/DerivedSo urces/x86_64 -I/Users/tim/Library/Developer/Xcode/DerivedData/RBSpeech-gglcnsigefizlfbidk whbsxvlwng/Build/Intermediates/RBSpeech.build/Debug/RBSpeech.build/DerivedSo urces -F/Users/tim/Library/Developer/Xcode/DerivedData/RBSpeech-gglcnsigefizlfbidk whbsxvlwng/Build/Products/Debug -I/Users/tim/developer/libraries/wxwidgets/build-debug/lib/wx/include/osx_co coa-unicode-static-2.9 -I/Users/tim/developer/libraries/wxwidgets/include -D_FILE_OFFSET_BITS=64 -D__WXMAC__ -D__WXOSX__ -D__WXOSX_COCOA__ -include /Users/tim/Library/Developer/Xcode/DerivedData/RBSpeech-gglcnsigefizlfbidkwh bsxvlwng/Build/Intermediates/PrecompiledHeaders/RBSpeech-Prefix-filshqejewqv wmcnuphmjzrmapcf/RBSpeech-Prefix.pch -c /Users/tim/Developer/RBSpeech/../Sources/SurfaceReader/RBSpeech.mm -o /Users/tim/Library/Developer/Xcode/DerivedData/RBSpeech-gglcnsigefizlfbidkwh bsxvlwng/Build/Intermediates/RBSpeech.build/Debug/RBSpeech.build/Objects-nor mal/x86_64/RBSpeech.o cc1objplus: warning: -Wuninitialized is not supported without -O In file included from /users/tim/developer/libraries/boost_1_55_0/boost/type_traits/has_left_shift .hpp:43, from /users/tim/developer/libraries/boost_1_55_0/boost/lexical_cast.hpp:165, from /Users/tim/Developer/RBSpeech/../Sources/SurfaceReader/RBStringFuncs.hpp:11, from /Users/tim/Developer/RBSpeech/../Sources/SurfaceReader/RBSpeech.h:27, from /Users/tim/Developer/RBSpeech/../Sources/SurfaceReader/RBSpeech.mm:4: /users/tim/developer/libraries/boost_1_55_0/boost/type_traits/detail/has_bin ary_operator.hpp:155: error: expected unqualified-id before 'do' The project uses OSX10.8 as its base SDK, but has OSX10.6 as its deployment target to provide backward compatibility and I made sure that my Boost libraries specified the 10.6 SDK as a minimum. Can anybody advise, please? Best wishes. Tim Burgess