use rubber instead of an arbitrary number of compilation

Makefile.in

+
 ##########################################################################
 #                                                                        #
 #  Copyright (C) 2010-                                                   #
@@ -750,18 +751,16 @@ DOC = doc/manual.pdf
 
 doc: $(DOC)
 
+.PHONY:$(DOC)
+
 doc/manual.pdf: doc/apidoc.tex doc/manual.tex doc/version.tex
-	cd doc; pdflatex manual
-	cd doc; makeglossaries manual
-	cd doc; pdflatex manual
-	cd doc; makeglossaries manual
-	cd doc; pdflatex manual
+	cd doc; rubber -d manual.tex
 
-doc/manual.html: doc/manual.tex doc/version.tex
-	$(MAKE) -C doc manual.html
+# doc/manual.html: doc/manual.tex doc/version.tex
+# 	$(MAKE) -C doc manual.html
 
 clean::
-	$(MAKE) -C doc clean
+	cd doc; rubber -d --clean manual.tex
 
 ##########
 # API DOC