[CMake] problem w/ "find_package"_ makefile does not always compile

[ny]

** Apologies for double-posting my earlier message got truncated **

greetings!

I spent enough time trying to make the software work,
so I'd be happy to get some feedback::
I built research code written in (templated) c++, size is approximately
~15K lines. I am on a mac and do not use Cocoa(/xcode), straight from
command line. Note that I choose to generate a Unix makefile, not an
xcode project and I am on snow leopard 10.6.5 w/ g++ 4.2.1.
The pain was that there were no makefile coming along w/ the project,
so I had to translate the *.vcproj file from scratch to CMakelists and
then convert it to makefile. My directories structure (directories marked
w/ DIR_ else are files, indentation denotes deeper level)::

DIR_4DMPU_exampleTest

      4DMPU_example.cpp
      DIR_ann_1.1.2
      DIR_cmake
      CMakeLists.txt
      FindANN.cmake
          Modules
              FindANN.cmake

      DIR_include

      DIR_mc4d_tables
          num_tet_table.cpp
          tet_table.cpp
          vert_table.cpp

DIR_4DMPU_exampleTestBin

In the cmake GUI I add:
ANN_LIBRARY
 /Users/nikos/Downloads/4DMPU_exampleTest/ann_1.1.2/include
ANN_INCLUDE_DIR
/Users/nikos/Downloads/4DMPU_exampleTest/ann_1.1.2/lib/libANN.a

My CMakeLists.txt is::

cmake_minimum_required(VERSION 2.8)
project( 4DMPU_example )

SET (CMAKE_BUILD_TYPE DEBUG)

set(SOURCE_FILES
4DMPU_example.cpp
mc4d_tables/num_tet_table.cpp
mc4d_tables/tet_table.cpp
mc4d_tables/vert_table.cpp
)

set(INCLUDE_FILES
include/4dtables.h
include/ann_helper.h
                   ...                     # more headers
        include/Volume.h ann_1.1.2/include
        include/VolumeIO.h
)

include_directories(
  ${PROJECT_SOURCE_DIR}/ann_1.1.2/include
  ${PROJECT_SOURCE_DIR}/ann_1.1.2/lib
  include
)

INCLUDE(FindANN.cmake)
IF(ANN_FOUND)
  INCLUDE_DIRECTORIES( ${ANN_INCLUDE_DIR} )
ENDIF(ANN_FOUND)

set(LIBS ${LIBS} ${ANN_LIBRARY})

add_executable( 4DMPU_example ${SOURCE_FILES} )
target_link_libraries( 4DMPU_example ${LIBS} )

and the content of the FindANN.cmake::

FIND_LIBRARY(ANN_LIBRARY lANN
${PROJECT_SOURCE_DIR}/ann_1.1.2/lib
  )
FIND_PATH( ANN_INCLUDE_DIR ANN/ANN.h ANN/ANNperf.h ANN/ANNx.h
   ${PROJECT_SOURCE_DIR}/ann_1.1.2/include
       )

IF(ANN_LIBRARY)
  IF(ANN_INCLUDE_DIR)
SET(ANN_FOUND TRUE)
  ENDIF(ANN_INCLUDE_DIR)
ENDIF(ANN_LIBRARY)

The project compiles fine this way.

Now, the problem is that if I follow the advice below

http://www.cmake.org/Wiki/CMake:How_To_Find_Libraries#Using_external_libraries_in_your_project

and add the line

set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH}
"${CMAKE_SOURCE_DIR}/cmake/Modules/")

and, moreover, substitute

include_directories(
  ${PROJECT_SOURCE_DIR}/ann_1.1.2/include
  ${PROJECT_SOURCE_DIR}/ann_1.1.2/lib
  include
)

with

find_package(ANN REQUIRED)
include_directories(${ANN_INCLUDE_DIR}
include
)

into CMakeLists.txt I get a linking problem.
I do not reproduce the message -> the point is that the ANN library is not
linked
w/ my object files. Can anyone tell me what I am doing wrong in the 2nd
case?

Note also that in the 2nd case I explicitly add::

ANN_DIR            /Users/nikos/Downloads/4DMPU_exampleTest/cmake/Modules

in the cmake GUI.


Thanks for any pointers
N
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