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diff --git a/src/__STDC_VERSION__.c b/src/__STDC_VERSION__.c
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+#define __STDC_VERSION__ /** supported C standard **/
+/***
+declares the supported version of ISO/IEC 9899. If THIS() is not defined,
+the implementation only supports ISO/IEC 9899:1990, without AMD1.
+***/
+/*
+VALUE_SELECT(`199409L', `ISO/IEC 9899:1990 AMD1')
+VALUE_SELECT(`199901L', `ISO/IEC 9899:1999')
+VALUE_SELECT(`201112L', `ISO/IEC 9899:2011')
+STDC(199409)
+*/