Index: uspace/lib/posix/include/posix/stdio.h
===================================================================
--- uspace/lib/posix/include/posix/stdio.h	(revision 1c635d6076d5ecbddc9b9e9a97d69324a6d97b18)
+++ uspace/lib/posix/include/posix/stdio.h	(revision 794e368715ec380ebe888af673c8db3fae585d9f)
@@ -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