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-rw-r--r--newlib/libc/include/sys/config.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/newlib/libc/include/sys/config.h b/newlib/libc/include/sys/config.h
index 60c6eb9fb..74860b808 100644
--- a/newlib/libc/include/sys/config.h
+++ b/newlib/libc/include/sys/config.h
@@ -128,6 +128,7 @@ typedef unsigned int __uint32_t;
#if defined(__CYGWIN32__) || defined(__CYGWIN__)
#define __FILENAME_MAX__ (260 - 1 /* NUL */)
+#define _READ_WRITE_RETURN_TYPE ssize_t
#if defined(__INSIDE_CYGWIN__) || defined(_COMPILING_NEWLIB)
#define __IMPORT
#else