Makefile.in and Makefile not generated when using a static library

[isulsz]

Hi,
I am new to GNU Auto tools and I am trying to build a project that contains
several source files and a static library. My directory is like: 
(project root)/src/app/: This contains the source files to build a binary
(project root)/src/Random/: This contains the source files to build a
library called librng.a

The Makefile.am in /src/Random/ is:
lib_LIBRARIES = librng.a
librng_a_SOURCES = (A list of .cpp and .h files)

The Makefile.am in /src is
SUBDIRS = app Random

The Makefile.am in (project root) is
SUBDIRS = src

The configure.in is
AC_INIT(./src/app/SimpMSourSimu.cpp)
AM_INIT_AUTOMAKE(MultiSour, 0.8)
AC_PROG_CXX
AC_PROG_INSTALL
AC_PROG_RANLIB
AC_OUTPUT(src/app/Makefile, src/Random/Makefile, Makefile)


I ran:
aclocal
autoconf
libtoolize --automake
automake

But when I run ./configure, it says
 src/Random/Makefile: No such file or directory

And I cannot find Makefile.in in src/Random directory. But  I can find
Makefile.in in src/app directory. 
Why the automake not generate Makefile.in in src/Random directory?

Thanks!
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