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-rw-r--r--include/stdio.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/include/stdio.h b/include/stdio.h
index 98b6431296ada..8cb07e3662892 100644
--- a/include/stdio.h
+++ b/include/stdio.h
@@ -240,7 +240,7 @@ int getc __P((FILE *));
int getchar __P((void));
char *gets __P((char *));
#if !defined(_ANSI_SOURCE) && !defined(_POSIX_SOURCE)
-extern int sys_nerr; /* perror(3) external variables */
+extern __const int sys_nerr; /* perror(3) external variables */
extern __const char *__const sys_errlist[];
#endif
void perror __P((const char *));