add findQT module

FindQT.cmake

+# - Searches for all installed versions of QT.
+# This should only be used if your project can work with multiple
+# versions of QT.  If not, you should just directly use FindQt4 or FindQt3.
+# If multiple versions of QT are found on the machine, then
+# The user must set the option DESIRED_QT_VERSION to the version
+# they want to use.  If only one version of qt is found on the machine,
+# then the DESIRED_QT_VERSION is set to that version and the 
+# matching FindQt3 or FindQt4 module is included.
+# Once the user sets DESIRED_QT_VERSION, then the FindQt3 or FindQt4 module
+# is included.
+#
+#  QT_REQUIRED if this is set to TRUE then if CMake can 
+#              not find QT4 or QT3 an error is raised 
+#              and a message is sent to the user.
+#
+#  DESIRED_QT_VERSION OPTION is created
+#  QT4_INSTALLED is set to TRUE if qt4 is found.
+#  QT3_INSTALLED is set to TRUE if qt3 is found.
+
+
+
+# look for signs of qt3 installations
+
+message(STATUS "Hi there")
+
+FILE(GLOB GLOB_TEMP_VAR /usr/lib/qt-3*/bin/qmake)
+IF(GLOB_TEMP_VAR)
+  SET(QT3_INSTALLED TRUE)
+ENDIF(GLOB_TEMP_VAR)
+SET(GLOB_TEMP_VAR)
+
+FILE(GLOB GLOB_TEMP_VAR /usr/local/qt-x11-commercial-3*/bin/qmake)
+IF(GLOB_TEMP_VAR)
+  SET(QT3_INSTALLED TRUE)
+ENDIF(GLOB_TEMP_VAR)
+SET(GLOB_TEMP_VAR)
+
+# look for qt4 installations
+FILE(GLOB GLOB_TEMP_VAR /usr/local/qt-x11-commercial-4*/bin/qmake)
+IF(GLOB_TEMP_VAR)
+  SET(QT4_INSTALLED TRUE)
+ENDIF(GLOB_TEMP_VAR)
+SET(GLOB_TEMP_VAR)
+
+FILE(GLOB GLOB_TEMP_VAR /usr/local/Trolltech/Qt-4*/bin/qmake)
+IF(GLOB_TEMP_VAR)
+  SET(QT4_INSTALLED TRUE)
+ENDIF(GLOB_TEMP_VAR)
+SET(GLOB_TEMP_VAR)
+
+# now find qmake
+FIND_PROGRAM(QT_QMAKE_EXECUTABLE_FINDQT NAMES qmake PATHS "${QT_SEARCH_PATH}/bin" "$ENV{QTDIR}/bin")
+IF(QT_QMAKE_EXECUTABLE_FINDQT)
+  EXEC_PROGRAM(${QT_QMAKE_EXECUTABLE_FINDQT} ARGS "-query QT_VERSION"
+    OUTPUT_VARIABLE QTVERSION)
+  IF(QTVERSION MATCHES "4.*")
+    SET(QT_QMAKE_EXECUTABLE ${QT_QMAKE_EXECUTABLE_FINDQT} CACHE PATH "QT4 qmake program.")
+    SET(QT4_INSTALLED TRUE)
+  ENDIF(QTVERSION MATCHES "4.*")
+  IF(QTVERSION MATCHES "Unknown")
+    SET(QT3_INSTALLED TRUE)
+  ENDIF(QTVERSION MATCHES "Unknown")
+ENDIF(QT_QMAKE_EXECUTABLE_FINDQT)
+
+IF(QT_QMAKE_EXECUTABLE_FINDQT)
+  EXEC_PROGRAM( ${QT_QMAKE_EXECUTABLE_FINDQT}
+    ARGS "-query QT_INSTALL_HEADERS" 
+    OUTPUT_VARIABLE qt_headers )
+ENDIF(QT_QMAKE_EXECUTABLE_FINDQT)
+
+FIND_FILE( QT4_QGLOBAL_H_FILE qglobal.h
+  "${QT_SEARCH_PATH}/Qt/include"
+  "[HKEY_CURRENT_USER\\Software\\Trolltech\\Qt3Versions\\4.0.0;InstallDir]/include/Qt"
+  "[HKEY_CURRENT_USER\\Software\\Trolltech\\Versions\\4.0.0;InstallDir]/include/Qt"
+  ${qt_headers}/Qt
+  $ENV{QTDIR}/include/Qt
+  /usr/local/qt/include/Qt
+  /usr/local/include/Qt
+  /usr/lib/qt/include/Qt
+  /usr/include/Qt
+  /usr/share/qt4/include/Qt
+  C:/Progra~1/qt/include/Qt )
+
+IF(QT4_QGLOBAL_H_FILE)
+  SET(QT4_INSTALLED TRUE)
+ENDIF(QT4_QGLOBAL_H_FILE)
+
+FIND_FILE( QT3_QGLOBAL_H_FILE qglobal.h
+  "${QT_SEARCH_PATH}/Qt/include" 
+ "[HKEY_CURRENT_USER\\Software\\Trolltech\\Qt3Versions\\3.2.1;InstallDir]/include/Qt"
+  "[HKEY_CURRENT_USER\\Software\\Trolltech\\Qt3Versions\\3.2.0;InstallDir]/include/Qt"
+  "[HKEY_CURRENT_USER\\Software\\Trolltech\\Qt3Versions\\3.1.0;InstallDir]/include/Qt"
+  C:/Qt/3.3.3Educational/include
+  $ENV{QTDIR}/include
+  /usr/include/qt3/Qt
+  /usr/local/qt/include
+  /usr/local/include
+  /usr/lib/qt/include
+  /usr/include
+  /usr/share/qt3/include
+  C:/Progra~1/qt/include
+  /usr/include/qt3 )
+
+IF(QT3_QGLOBAL_H_FILE)
+  SET(QT3_INSTALLED TRUE)
+ENDIF(QT3_QGLOBAL_H_FILE)
+
+IF(QT3_INSTALLED AND QT4_INSTALLED )
+  # force user to pick if we have both
+  SET(DESIRED_QT_VERSION 0 CACHE STRING "Pick a version of QT to use: 3 or 4")
+ELSE(QT3_INSTALLED AND QT4_INSTALLED )
+  # if only one found then pick that one
+  IF(QT3_INSTALLED)
+    SET(DESIRED_QT_VERSION 3 CACHE STRING "Pick a version of QT to use: 3 or 4")
+  ENDIF(QT3_INSTALLED)
+  IF(QT4_INSTALLED)
+    SET(DESIRED_QT_VERSION 4 CACHE STRING "Pick a version of QT to use: 3 or 4")
+  ENDIF(QT4_INSTALLED)
+ENDIF(QT3_INSTALLED AND QT4_INSTALLED )
+
+IF(DESIRED_QT_VERSION MATCHES 3)
+  SET(Qt3_FIND_REQUIRED ${Qt_FIND_REQUIRED})
+  SET(Qt3_FIND_QUIETLY  ${Qt_FIND_QUIETLY})
+  INCLUDE(FindQt3)
+ENDIF(DESIRED_QT_VERSION MATCHES 3)
+IF(DESIRED_QT_VERSION MATCHES 4)
+  SET(Qt4_FIND_REQUIRED ${Qt_FIND_REQUIRED})
+  SET(Qt4_FIND_QUIETLY  ${Qt_FIND_QUIETLY})
+  INCLUDE(FindQt4)
+ENDIF(DESIRED_QT_VERSION MATCHES 4)
+
+IF(NOT QT3_INSTALLED AND NOT QT4_INSTALLED)
+  IF(QT_REQUIRED)
+    MESSAGE(SEND_ERROR "CMake was unable to find any QT versions, put qmake in your path, or set QT_QMAKE_EXECUTABLE.")
+  ENDIF(QT_REQUIRED)
+ELSE(NOT QT3_INSTALLED AND NOT QT4_INSTALLED)
+  IF(NOT QT_FOUND AND NOT DESIRED_QT_VERSION)
+    IF(QT_REQUIRED)
+      MESSAGE(SEND_ERROR "Multiple versions of QT found please set DESIRED_QT_VERSION")
+    ELSE(QT_REQUIRED)
+      MESSAGE("Multiple versions of QT found please set DESIRED_QT_VERSION")
+    ENDIF(QT_REQUIRED)
+  ENDIF(NOT QT_FOUND AND NOT DESIRED_QT_VERSION)
+  IF(NOT QT_FOUND AND DESIRED_QT_VERSION)
+    IF(QT_REQUIRED)
+      MESSAGE(FATAL_ERROR "CMake was unable to find QT version: ${DESIRED_QT_VERSION}. Set advanced values QT_QMAKE_EXECUTABLE and QT${DESIRED_QT_VERSION}_QGLOBAL_FILE, if those are set then QT_QT_LIBRARY or QT_LIBRARY_DIR.")
+    ELSE(QT_REQUIRED)
+      MESSAGE( "CMake was unable to find desired QT version: ${DESIRED_QT_VERSION}. Set advanced values QT_QMAKE_EXECUTABLE and QT${DESIRED_QT_VERSION}_QGLOBAL_FILE.")
+    ENDIF(QT_REQUIRED)
+  ENDIF(NOT QT_FOUND AND DESIRED_QT_VERSION)
+ENDIF(NOT QT3_INSTALLED AND NOT QT4_INSTALLED)
+MARK_AS_ADVANCED(QT3_QGLOBAL_H_FILE QT4_QGLOBAL_H_FILE QT_QMAKE_EXECUTABLE_FINDQT)