krb5_vprepend_error_message -  Add a prefix to the message for an error code using a va_list. 
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.. c:function:: void krb5_vprepend_error_message(krb5_context ctx, krb5_error_code code, const char * fmt, va_list args)

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:param:

	          **[in]** **ctx** - Library context

	          **[in]** **code** - Error code

	          **[in]** **fmt** - Format string for error message prefix

	          **[in]** **args** - List of vprintf(3) style arguments


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This function is similar to :c:func:`krb5_prepend_error_message()` , but uses a va_list instead of variadic arguments.






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