Index: uspace/lib/c/include/io/klog.h
===================================================================
--- uspace/lib/c/include/io/klog.h	(revision fc51296af4f45da426f5626f3573adee6b0babda)
+++ uspace/lib/c/include/io/klog.h	(revision 1cab9972b0df6650e445a84ef3e44c3894940b79)
@@ -37,7 +37,10 @@
 
 #include <sys/types.h>
+#include <stdarg.h>
 
 extern size_t klog_write(const void *, size_t);
 extern void klog_update(void);
+extern int klog_printf(const char *, ...);
+extern int klog_vprintf(const char *, va_list);
 
 #endif