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@@ -46,7 +46,7 @@ int vsnprintf(char *__restrict buf, size_t size,
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__INIT_MBSTATE(&(f.__state));
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#endif /* __STDIO_MBSTATE */
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-#if defined(__USE_OLD_VFPRINTF__) && defined(__UCLIBC_HAS_THREADS__)
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+#if (defined(__STDIO_BUFFERS) || defined(__USE_OLD_VFPRINTF__)) && defined(__UCLIBC_HAS_THREADS__)
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f.__user_locking = 1; /* Set user locking. */
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__stdio_init_mutex(&f.__lock);
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#endif
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