cmake + cpp file + c file + subdir

[Laurent Montel]

Hi,
I have a problem:
I have a card.cpp and card.c into subdir
and cmake said me that it's the same:
(kdegames/kpat)
set(libfcs_SRCS
    ${CMAKE_SOURCE_DIR}/kpat/freecell-solver/alloc.c
    ${CMAKE_SOURCE_DIR}/kpat/freecell-solver/app_str.c
    ${CMAKE_SOURCE_DIR}/kpat/freecell-solver/caas.c
    ${CMAKE_SOURCE_DIR}/kpat/freecell-solver/card.c
    ${CMAKE_SOURCE_DIR}/kpat/freecell-solver/cl_chop.c
    ${CMAKE_SOURCE_DIR}/kpat/freecell-solver/cmd_line.c
    ${CMAKE_SOURCE_DIR}/kpat/freecell-solver/fcs_dm.c
    ${CMAKE_SOURCE_DIR}/kpat/freecell-solver/fcs_hash.c
    ${CMAKE_SOURCE_DIR}/kpat/freecell-solver/fcs_isa.c
    ${CMAKE_SOURCE_DIR}/kpat/freecell-solver/freecell.c
...
)

set(kpat_SRCS ${libfcs_SRCS}
   main.cpp
   cardmaps.cpp
   card.cpp
   dealer.cpp
   pwidget.cpp
   pile.cpp
   deck.cpp
   pile_algorithms.cpp
   kings.cpp
   freecell.cpp
...
)
and cmake said me:
Warning: Source file "card.cpp" is listed multiple times for target "kpat".
Warning: Source file "freecell.cpp" is listed multiple times for target 
"kpat".


Could you look at it ?
thanks
Regards