Autoconf, Automake, and Libtool: Standard library headers

| ### 16.2.12 Standard library headers Newer C++ implementations provide a new set of standard library header files. These are distinguished from older incompatible header files by their filenames--the new headers omit the conventional ``.h'` extension. Classes and other declarations in the new headers are placed in the `std` namespace. Detecting the kind of header files present on any given system is an ideal application of Autoconf. For instance, the header ``<vector>'` declares the class `std::vector<T>`. However, if it is not available, ``<vector.h>'` declares the class `vector<T>` in the global namespace.

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