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--- CMakeLists.txt_use_cxx17	2019-07-29 10:31:06.000000000 +0200
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+++ CMakeLists.txt	2019-07-31 19:04:52.285195735 +0200
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@@ -118,9 +118,9 @@
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 endif()
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 if (CMAKE_MAJOR_VERSION LESS 3 OR CMAKE_MINOR_VERSION LESS 1)
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-  set(CMAKE_CXX_FLAGS ${CMAKE_CXX_FLAGS} "-std=c++11")
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+  set(CMAKE_CXX_FLAGS ${CMAKE_CXX_FLAGS} "-std=gnu++17")
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 else()
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-  set(CMAKE_CXX_STANDARD 11)
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+  set(CMAKE_CXX_STANDARD 17)
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 endif()
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 CHECK_FUNCTION_EXISTS(strptime HAVE_STRPTIME)