fixed doxygen install/clean

[[Imported from SVN: r4973]]

doc/doxygen/Makefile.am

@@ -34,7 +34,7 @@ endif
 
 
 #we need this in the distribution
-EXTRA_DIST = $(WHAT) html-dist $(DOXYGENHEADER) doxy-footer.html $(PAGES)
+EXTRA_DIST = $(WHAT) $(DOXYGEN_DIST) $(DOXYGENHEADER) doxy-footer.html $(PAGES)
 
 doxygendir = $(datadir)/doc/dune-common/doxygen
 doxygen_DATA = $(WHAT)
@@ -62,7 +62,7 @@ DEPENDON = -name \*.cc -o -name \*.hh -o -name \*.png
 doxygen-tag: FORCE $(DOXYGENHEADERBUILD)
 	set -e; \
 	if test -e Doxyfile; then \
-	  if test ! -e doxygen-tag || test x"`find $(top_srcdir) \( $(DEPENDON) \) -a -newer doxygen-tag -print`" != x ; then \
+	  if test ! -e doxygen-tag || test x"`find $(top_srcdir) \( $(DEPENDON) \) -a -cnewer doxygen-tag -print`" != x ; then \
 	    echo Running doxygen. This may take a while... ; \
 	    ( cat Doxyfile; $(DOYXFILE_OVERWRITE) ) > Doxyfile.tmp; \
 	    $(DOXYGEN) Doxyfile.tmp > doxygen.log 2>&1 <&- ; \