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-rw-r--r--ports/esp32/memory.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/ports/esp32/memory.h b/ports/esp32/memory.h
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index 000000000..f3777b0e3
--- /dev/null
+++ b/ports/esp32/memory.h
@@ -0,0 +1,2 @@
+// this is needed for extmod/crypto-algorithms/sha256.c
+#include <string.h>