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-rw-r--r--components/libc/compilers/newlib/stdio.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/components/libc/compilers/newlib/stdio.c b/components/libc/compilers/newlib/stdio.c
index 394705bf15..9f30106b72 100644
--- a/components/libc/compilers/newlib/stdio.c
+++ b/components/libc/compilers/newlib/stdio.c
@@ -31,6 +31,8 @@
#define STDIO_DEVICE_NAME_MAX 32
+int _EXFUN(fileno, (FILE *));
+
static FILE* std_console = NULL;
int libc_stdio_set_console(const char* device_name, int mode)