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diff -ruN digikam-1.9.0-vanilla/CMakeLists.txt digikam-1.9.0/CMakeLists.txt
--- digikam-1.9.0-vanilla/CMakeLists.txt	2011-02-27 21:16:18.000000000 +0100
+++ digikam-1.9.0/CMakeLists.txt	2011-02-28 18:56:39.000000000 +0100
@@ -1421,8 +1421,15 @@
 # ==================================================================================================
 # API documentation generation
 
+# Checks if user ask to build documentation.
+IF(BUILD_DOC)
+
 IF(DOXYGEN_FOUND)
 
+    MESSAGE(STATUS "")
+    MESSAGE(STATUS "API documentation will be installed")
+    MESSAGE(STATUS "")
+
     SET(API_DIR ${CMAKE_BINARY_DIR}/api)
     SET(SOURCE_DIR ${CMAKE_SOURCE_DIR})
     SET(DOXYFILE ${CMAKE_BINARY_DIR}/Doxyfile)
@@ -1430,10 +1437,29 @@
 
     CONFIGURE_FILE(Doxyfile.cmake ${DOXYFILE})
 
-    ADD_CUSTOM_TARGET(doc ${DOXYGEN_EXECUTABLE} ${DOXYFILE}
+    ADD_CUSTOM_TARGET(doc ALL ${DOXYGEN_EXECUTABLE} ${DOXYFILE}
                       WORKING_DIRECTORY ${CMAKE_BINARY_DIR})
+
+ELSE(DOXYGEN_FOUND)
+
+    MESSAGE(FATAL_ERROR "API documentation requested but doxygen not found")
+
 ENDIF(DOXYGEN_FOUND)
+
+ELSE(BUILD_DOC)
+
+    MESSAGE(STATUS "")
+    MESSAGE(STATUS "Documentation will NOT be installed")
+    MESSAGE(STATUS "Because the option -DBUILD_DOC=ON wasn't passed to cmake")
+    MESSAGE(STATUS "")
+
+ENDIF(BUILD_DOC)
+
 find_package(Msgfmt REQUIRED)
 find_package(Gettext REQUIRED)
 add_subdirectory( po )
 
+# Build the handbook
+add_subdirectory( doc )
+
+