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-rw-r--r--libstdc++-v3/libio/_G_config.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/libstdc++-v3/libio/_G_config.h b/libstdc++-v3/libio/_G_config.h
index 6e5ab157c98..2cdeee358e9 100644
--- a/libstdc++-v3/libio/_G_config.h
+++ b/libstdc++-v3/libio/_G_config.h
@@ -16,6 +16,7 @@
#define __need_wchar_t
#define __need_wint_t
#define __need_NULL
+#define __need_ptrdiff_t
#ifdef __cplusplus
# include <cstddef>
#else
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