Append to variable CXX-FLAGS the set of compile-time flags that should be passed to the C++ compiler in order to enable use of C++ features as defined in the ANSI C++ standard (eg. use of standard iostream classes in the ‘std’ namespace, etc.). Note that if you use GNU Libtool you may need to prefix each of those flags with ‘-Xcompiler’ so that Libtool doesn’t discard them (see Libtool’s manual and ‘AC_LIBTOOLIZE_CFLAGS’).
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