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Some files, e.g. encode_accessors.c, use loop initial declarations that are only allowed in C99 mode. Newer compilers enable that mode automatically, but olders might fail. CMAKE_C_STANDARD got add in CMake-3.1, so let's increase the minimal version by 0.1. Signed-off-by: Christoph Junghans <junghans@votca.org>
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