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diff -rupN --no-dereference gmsh-4.8.4-source/CMakeLists.txt gmsh-4.8.4-source-new/CMakeLists.txt
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--- gmsh-4.8.4-source/CMakeLists.txt	2021-04-29 15:05:54.751037956 +0200
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+++ gmsh-4.8.4-source-new/CMakeLists.txt	2021-04-29 15:05:54.754037956 +0200
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@@ -17,7 +17,7 @@ endif()
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 project(gmsh CXX C)
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 # require C++11 and request C99
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-set(CMAKE_CXX_STANDARD 11)
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+set(CMAKE_CXX_STANDARD 14)
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 set(CMAKE_CXX_STANDARD_REQUIRED ON)
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 set(CMAKE_C_STANDARD 99)
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