Add doxygen target.

libgnucash/doc/CMakeLists.txt

@@ -35,6 +35,11 @@ SET(doc_FILES
         user-prefs-howto.txt
         )
 
-SET_LOCAL_DIST(doc_DIST_local CMakeLists.txt ${doc_FILES})
+SET_LOCAL_DIST(doc_DIST_local CMakeLists.txt Makefile.am ${doc_FILES})
 SET(doc_DIST ${doc_DIST_local} ${doc_design_DIST} ${doc_xml_DIST} PARENT_SCOPE)
 
+find_program(DOXYGEN doxygen)
+if (NOT ${DOXYGEN} STREQUAL "DOXYGEN-NOTFOUND")
+  configure_file(doxygen.cfg.in doxygen.cfg)
+  add_custom_target(doc ${DOXYGEN} doxygen.cfg)
+endif()

libgnucash/doc/doxygen.cfg.in

@@ -652,8 +652,11 @@ WARN_LOGFILE           = doxygen.log
 # directories like "/usr/src/myproject". Separate the files or directories
 # with spaces.
 
-INPUT                  = @top_srcdir@/libgnucash \
-                         @top_srcdir@/libgnucash/engine/
+INPUT                  = ${CMAKE_SOURCE_DIR}/libgnucash \
+                         ${CMAKE_SOURCE_DIR}/gnucash \
+                         ${CMAKE_SOURCE_DIR}/common \
+                         ${CMAKE_SOURCE_DIR}/bindings \
+                         ${CMAKE_SOURCE_DIR}/libgnucash/engine/
 
 # This tag can be used to specify the character encoding of the source files
 # that doxygen parses. Internally doxygen uses the UTF-8 encoding, which is
@@ -1548,7 +1551,7 @@ SEARCH_INCLUDES        = YES
 # contain include files that are not input files but should be processed by
 # the preprocessor.
 
-INCLUDE_PATH           = @top_srcdir@/libgnucash/engine/
+INCLUDE_PATH           = ${CMAKE_SOURCE_DIR}/libgnucash/engine/
 
 # You can use the INCLUDE_FILE_PATTERNS tag to specify one or more wildcard
 # patterns (like *.h and *.hpp) to filter out the header-files in the