Index: uspace/lib/libc/generic/vfs/vfs.c
===================================================================
--- uspace/lib/libc/generic/vfs/vfs.c	(revision 0cb2d725c51ac13d0cd117c5867eeec55b19cb44)
+++ uspace/lib/libc/generic/vfs/vfs.c	(revision 21f32ee1dcb810787a2a4e2ce4f2f3d11dd849cc)
@@ -197,4 +197,9 @@
 }
 
+int unmount(const char *mp)
+{
+	return ENOTSUP;
+}
+
 static int open_internal(const char *abs, size_t abs_size, int lflag, int oflag)
 {
Index: uspace/lib/libc/include/vfs/vfs.h
===================================================================
--- uspace/lib/libc/include/vfs/vfs.h	(revision 0cb2d725c51ac13d0cd117c5867eeec55b19cb44)
+++ uspace/lib/libc/include/vfs/vfs.h	(revision 21f32ee1dcb810787a2a4e2ce4f2f3d11dd849cc)
@@ -55,4 +55,5 @@
 extern int mount(const char *, const char *, const char *, const char *,
     unsigned int);
+extern int unmount(const char *);
 
 extern void __stdio_init(int filc, fdi_node_t *filv[]);