added doxygen support

doc/Makefile.am

@@ -0,0 +1,18 @@
+if HAVE_DOXYGEN
+directory = $(top_srcdir)/doc/man/man3/
+
+dist_man_MANS = $(directory)/man_page_1.3 $(directory)/man_page_2.3
+$(directory)/man_page_1.3: doxyfile.stamp
+$(directory)/man_page_2.3: doxyfile.stamp
+
+doxyfile.stamp:
+	$(DOXYGEN) Doxyfile
+	echo Timestamp > doxyfile.stamp
+
+CLEANFILES = doxyfile.stamp
+
+all-local: doxyfile.stamp
+clean-local:
+	rm -rf $(top_srcdir)/docs/man
+
+endif