[CMake] find_library not finding libraries - why?

[cornelis at bockemuehl.ch]

In a CMakeLists.txt I have the following lines of code:

# with this the user will be asked for a path that has then
# lib64 other subdirectories that are specified below
FIND_PATH(CLP_DIR LIBCLP)

SET(CLP_LIB ${CLP_DIR}/LIB64)

# after the user specified CLP_DIR this shows what is expected:
# the full path to the libraries, but...
MESSAGE(AUTHOR_WARNING ${CLP_LIB})

# with the following I think I cannot indicate more clearly where the  
libraries actually are:
FIND_LIBRARY(CLP_LIBRARY       NAMES LIBCLP       PATHS ${CLP_LIB}  
NO_DEFAULT_PATH)
FIND_LIBRARY(COINUTILS_LIBRARY NAMES LIBCOINUTILS PATHS ${CLP_LIB}  
NO_DEFAULT_PATH)
FIND_LIBRARY(OSI_LIBRARY       NAMES LIBOSI       PATHS ${CLP_LIB}  
NO_DEFAULT_PATH)
FIND_LIBRARY(OSICLP_LIBRARY    NAMES LIBOSICLP    PATHS ${CLP_LIB}  
NO_DEFAULT_PATH)

# ...here everything comes as -NOTFOUND
MESSAGE(AUTHOR_WARNING ${CLP_LIBRARY})
MESSAGE(AUTHOR_WARNING ${COINUTILS_LIBRARY})
MESSAGE(AUTHOR_WARNING ${OSI_LIBRARY})
MESSAGE(AUTHOR_WARNING ${OSICLP_LIBRARY})

A dir for the indicated directory shows the following files:

-rwxrwxrwx 1 cornelis users     907  8. Nov 18:37 libClp.la
lrwxrwxrwx 1 cornelis users      42  8. Nov 18:37 libClp.so ->  
libClp.so.1.13.11
lrwxrwxrwx 1 cornelis users      42  8. Nov 18:37 libClp.so.1 ->  
libClp.so.1.13.11
-rwxrwxrwx 1 cornelis users 1887336  8. Nov 18:37 libClp.so.1.13.11
-rwxrwxrwx 1 cornelis users    1010  8. Nov 18:37 libClpSolver.la
lrwxrwxrwx 1 cornelis users      54  8. Nov 18:37 libClpSolver.so ->  
libClpSolver.so.1.13.11
lrwxrwxrwx 1 cornelis users      54  8. Nov 18:37 libClpSolver.so.1 ->  
libClpSolver.so.1.13.11
-rwxrwxrwx 1 cornelis users  415224  8. Nov 18:37 libClpSolver.so.1.13.11
-rwxrwxrwx 1 cornelis users     870  8. Nov 18:37 libCoinUtils.la
lrwxrwxrwx 1 cornelis users      54  8. Nov 18:37 libCoinUtils.so ->  
libCoinUtils.so.3.10.14
lrwxrwxrwx 1 cornelis users      54  8. Nov 18:37 libCoinUtils.so.3 ->  
libCoinUtils.so.3.10.14
-rwxrwxrwx 1 cornelis users 1416632  8. Nov 18:37 libCoinUtils.so.3.10.14
-rwxrwxrwx 1 cornelis users    1059  8. Nov 18:37 libOsiClp.la
lrwxrwxrwx 1 cornelis users      48  8. Nov 18:37 libOsiClp.so ->  
libOsiClp.so.1.13.11
lrwxrwxrwx 1 cornelis users      48  8. Nov 18:37 libOsiClp.so.1 ->  
libOsiClp.so.1.13.11
-rwxrwxrwx 1 cornelis users  350080  8. Nov 18:37 libOsiClp.so.1.13.11
-rwxrwxrwx 1 cornelis users    1038  8. Nov 18:37 libOsiCommonTests.la
lrwxrwxrwx 1 cornelis users      62  8. Nov 18:37 libOsiCommonTests.so  
-> libOsiCommonTests.so.1.12.9
lrwxrwxrwx 1 cornelis users      62  8. Nov 18:37  
libOsiCommonTests.so.1 -> libOsiCommonTests.so.1.12.9
-rwxrwxrwx 1 cornelis users  619392  8. Nov 18:37 libOsiCommonTests.so.1.12.9
-rwxrwxrwx 1 cornelis users     905  8. Nov 18:37 libOsi.la
lrwxrwxrwx 1 cornelis users      40  8. Nov 18:37 libOsi.so ->  
libOsi.so.1.12.9
lrwxrwxrwx 1 cornelis users      40  8. Nov 18:37 libOsi.so.1 ->  
libOsi.so.1.12.9
-rwxrwxrwx 1 cornelis users  400776  8. Nov 18:37 libOsi.so.1.12.9
drwxrwxrwx 1 cornelis users    4096  8. Nov 18:37 pkgconfig

so the libraries are obviously there!

Questions:
WHAT AM I DOING WRONG?
WHAT DID I POSSIBLY MISUNDERSTAND REGARDING THE FIND_LIBRARY COMMAND?

Thanks for any helpful hints!
Cornelis
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