fatal error: string_view: No such file or directory about ftxui HOT 4 CLOSED

Seems like you haven't enabled C++17 (preferably C++20) support by adding -std=c++17 (or -std=c++20) to your compiler flags

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Thanks!

You are using GCC 6.3 (December 21, 2016). You need GCC 7 (May 2, 2017).

std::string_view is a C++17 feature which your ancient GCC version does not support. You need a more up-to-date compiler.

https://en.cppreference.com/w/cpp/compiler_support/17#C.2B.2B17_library_features#C.2B.2B17_library_features

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I've just downloaded and installed mingw, should it be latest version?..

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I downloaded mingw-w64 and used it for compilation. That helped.

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