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diff -ru digikam-1.6.0.orig/CMakeLists.txt digikam-1.6.0/CMakeLists.txt
--- digikam-1.6.0.orig/CMakeLists.txt	2010-11-22 18:50:48.000000000 +0100
+++ digikam-1.6.0/CMakeLists.txt	2010-11-25 00:16:54.000000000 +0100
@@ -1423,7 +1423,14 @@
 # ==================================================================================================
 # API documentation generation
 
-IF(DOXYGEN_FOUND)
+# 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})
@@ -1432,8 +1439,27 @@
 
     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})
-ENDIF(DOXYGEN_FOUND)
+
+  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)
+
+
 include(MacroOptionalAddSubdirectory)
 macro_optional_add_subdirectory( po )
+
+# Build the handbook
+add_subdirectory( doc )