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There is no file called bits/c++config.h in the c++ include directory which is required by the cstring header file. But when I include the the header cstring and compile with g++ , it does not give me error. The problem occurred when I tried to compile the program with clang++ compiler in the following way. $clang++ -cc1 -I/usr/include -I/usr/include/c++/4.6.1 -I/usr/lib/gcc/i686-linux-gnu/4.6.1 -I/usr/include/i386-linux-gnu -I opt_149739_build/include hello.cpp In file included from /media/space/hello.cpp:2: In file included from /media/space/opt_149739_build/include/clang/Driver/Driver.h:13: In file included from /media/space/opt_149739_build/include/clang/Basic/Diagnostic.h:17: In file included from /media/space/opt_149739_build/include/clang/Basic/DiagnosticIDs.h:18: In file included from /media/space/opt_149739_build/include/llvm/ADT/StringRef.h:14: /usr/include/c++/4.6.1/cstring:42:10: fatal error: 'bits/c++config.h' file not found #include <bits/c++config.h> I am using g++ 4.6.1 on Ubuntu 11.04 What went wrong?

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