[doxygen]

don't try to install doxygen when documentation is disabled

[[Imported from SVN: r6852]]

am/doxygen

@@ -93,9 +93,6 @@ doxygen-dist-install: $(DOXYGENTAG)
 
 dist-hook: doxygen-dist-install
 
-endif # DOXYGEN
-endif # BUILD_DOCS
-
 ####
 # how to install doxygen
 
@@ -111,6 +108,9 @@ uninstall-doxygen:
 install-documentation-local: install-doxygen
 uninstall-documentation-local: uninstall-doxygen
 
+endif # DOXYGEN
+endif # BUILD_DOCS
+
 ####
 # howto install doxygen in the web page
 include $(top_srcdir)/am/webstuff