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README, configure: adjust minimum compiler versions wrt. std::filesystem
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@ -90,7 +90,7 @@ programs and libraries you absolutely need are:
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literals for `std::string`, `[[maybe_unused]]` attribute, nested
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namespace definition, structured bindings, `std::optional`,
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`std::regex`. Others may be needed, too. For GCC this means at least
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v7; for clang v4 or later.
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v8; for clang v7 or later.
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- [libOgg](http://downloads.xiph.org/releases/ogg/) and
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[libVorbis](http://downloads.xiph.org/releases/vorbis/) for access to Ogg/OGM
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@ -241,6 +241,6 @@ AX_CXX17_FILESYSTEM_LIBRARY
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if test x"$missing_cxx_features" != x ; then
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printf "The following features of the C++17 standards are not supported by $CXX:$missing_cxx_features\n"
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printf "If you are using the GNU C compiler collection (gcc), you need\n"
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printf "at least v7; for clang v4 and newer should work.\n"
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printf "at least v8; for clang v7 and newer should work.\n"
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AC_MSG_ERROR([support for required C++17 features incomplete])
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fi
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