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-rw-r--r--ports/ARM7/chtypes.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/ports/ARM7/chtypes.h b/ports/ARM7/chtypes.h
index 21ee1c045..ab0dc36c8 100644
--- a/ports/ARM7/chtypes.h
+++ b/ports/ARM7/chtypes.h
@@ -22,6 +22,7 @@
#define __need_NULL
#define __need_size_t
+#define __need_ptrdiff_t
#include <stddef.h>
#if !defined(_STDINT_H) && !defined(__STDINT_H_)