Index: uspace/lib/posix/include/posix/stdio.h
===================================================================
--- uspace/lib/posix/include/posix/stdio.h	(revision 12b29f32772d8b50ed4478da4ccb5adf9396f70e)
+++ uspace/lib/posix/include/posix/stdio.h	(revision 75fe97b8311c155507b6ade3784b25bdbace2f5e)
@@ -107,4 +107,5 @@
 extern int snprintf(char *, size_t , const char *, ...) PRINTF_ATTRIBUTE(3, 4);
 #ifdef _GNU_SOURCE
+extern int vasprintf(char **, const char *, va_list);
 extern int asprintf(char **, const char *, ...) PRINTF_ATTRIBUTE(2, 3);
 #endif