Hello everyone. I use android-ndk (http://www.crystax.net/en/android/ndk/7) with boost-1.49. My code includes boost::chrono, and when I use gcc-4.4.3 everything goes fine, but when I swith on the gcc-4.6.3 (APP_USE_CPP0X := true) so than i get a strange mistake. C/C++ Problem 'u16string' in namespace 'std' does not name a type TestCore line 243, external location: /Users/user/Mobile/android-ndk-crystax/sources/boost/boost/ratio/ratio_io.hpp C/C++ Problem 'u16string' in namespace 'std' does not name a type TestCore line 242, external location: /Users/user/Mobile/android-ndk-crystax/sources/boost/boost/ratio/ratio_io.hpp C/C++ Problem 'u32string' in namespace 'std' does not name a type TestCore line 250, external location: /Users/user/Mobile/android-ndk-crystax/sources/boost/boost/ratio/ratio_io.hpp C/C++ Problem 'u32string' in namespace 'std' does not name a type TestCore line 249, external location: /Users/user/Mobile/android-ndk-crystax/sources/boost/boost/ratio/ratio_io.hpp C/C++ Problem 'u16string' in namespace 'std' does not name a type TestCore line 287, external location: /Users/user/Mobile/android-ndk-crystax/sources/boost/boost/ratio/ratio_io.hpp C/C++ Problem 'u16string' in namespace 'std' does not name a type TestCore line 286, external location: /Users/user/Mobile/android-ndk-crystax/sources/boost/boost/ratio/ratio_io.hpp C/C++ Problem 'u32string' in namespace 'std' does not name a type TestCore line 294, external location: /Users/user/Mobile/android-ndk-crystax/sources/boost/boost/ratio/ratio_io.hpp C/C++ Problem 'u32string' in namespace 'std' does not name a type TestCore line 293, external location: /Users/user/Mobile/android-ndk-crystax/sources/boost/boost/ratio/ratio_io.hpp C/C++ Problem 'u16string' in namespace 'std' does not name a type TestCore line 331, external location: /Users/user/Mobile/android-ndk-crystax/sources/boost/boost/ratio/ratio_io.hpp C/C++ Problem 'u16string' in namespace 'std' does not name a type TestCore line 330, external location: /Users/user/Mobile/android-ndk-crystax/sources/boost/boost/ratio/ratio_io.hpp C/C++ Problem 'u32string' in namespace 'std' does not name a type TestCore line 338, external location: /Users/user/Mobile/android-ndk-crystax/sources/boost/boost/ratio/ratio_io.hpp C/C++ Problem 'u32string' in namespace 'std' does not name a type TestCore line 337, external location: /Users/user/Mobile/android-ndk-crystax/sources/boost/boost/ratio/ratio_io.hpp C/C++ Problem 'u16string' in namespace 'std' does not name a type TestCore line 375, external location: /Users/user/Mobile/android-ndk-crystax/sources/boost/boost/ratio/ratio_io.hpp C/C++ Problem 'u16string' in namespace 'std' does not name a type TestCore line 374, external location: /Users/user/Mobile/android-ndk-crystax/sources/boost/boost/ratio/ratio_io.hpp ............................................... Does somebody can help me?