FIND_LIBRARY does not find existing libraries - qt

Question

In the function findQt4.cmake:
FIND_LIBRARY(QT_QTCORE_LIBRARY_RELEASE
NAMES QtCore QtCore4
HINTS ${QT_LIBRARY_DIR_TMP}
)
if I print:
MESSAGE("HINT PATH " ${QT_LIBRARY_DIR_TMP})
I will get:
~/dev/Libraries/Qt4.8.0/lib
In this directory there are: ~/dev/Libraries/Qt4.8.0/lib$ ls -all libQtCore*
I got:
-rw-r--r-- 1 abc abc 950 Nov 30 13:08 libQtCore.la
-rw-r--r-- 1 abc abc 942 Nov 30 13:07 libQtCore.prl
lrwxrwxrwx 1 abc abc 18 Nov 30 13:07 libQtCore.so -> libQtCore.so.4.8.0
lrwxrwxrwx 1 abc abc 18 Nov 30 13:08 libQtCore.so.4 -> libQtCore.so.4.8.0
lrwxrwxrwx 1 abc abc 18 Nov 30 13:08 libQtCore.so.4.8 -> libQtCore.so.4.8.0
-rwxr-xr-x 1 abc abc 2697932 Nov 30 13:08 libQtCore.so.4.8.0
But why the FIND_LIBRARY function return: QT_QTCORE_LIBRARY_RELEASE = NOT FOUND?
Even, there is no result if I do like this:
FIND_LIBRARY(QT_QTCORE_LIBRARY_RELEASE
NAMES libQtCore.so
HINTS ${QT_LIBRARY_DIR_TMP}
)

Answer 1

Instead of find_library() you can use find_package(). This is the common way for Qt with CMake.
# Find Qt package
find_package(Qt4 REQUIRED)
include(${QT_USE_FILE}) # Add and run Qt CMake modules
add_definitions(${QT_DEFINITIONS}) # Add definitions (if required)
# And later put all together
add_executable( ... )
target_link_libraries( ... ${QT_LIBRARIES}) # Link Qt libraries