Layout->Document->Document class->memoir?

[Marc Jeffrey Driftmeyer]

From LaTeXConfig.lyx

4.25 llncs
Found: no
CTAN: N/A
Notes: The document class llncs can be used to write articles for 
submission to the Springer journal  Lecture Notes in Computer Science . 
LATEX documents are available from Springer s ftp site on the following 
URL: ftp://trick.ntp.springer.de/pub/tex/latex/llncs/latex2e. The LYX 
layout file for this document class is still insufficiently tested.

4.26 memoir
Found: no
CTAN: macros/latex/contrib/supported/memoir/
Notes: Memoir is a flexible class for typesetting general fiction, 
non-fiction and mathematical works as books, reports, articles or 
manuscripts. Documents can use 9, 10, 11, 12, 14 or 17pt as the normal 
font size. Many methods are provided to let you create your own 
particular design.

This is just a snippet of the file generated after configuring and 
compiling source.

My question is simple: Is this to be expected that under 
lyx1.3.3/lib/layout/ several of the .layout files will not be found 
during configure?

-Sincerely,

Marc J. Driftmeyer

P.S.  I chose memoir because I want to use it and upon not finding it 
and reading the LaTeXConfig.lyx I saw several missing.