Have configure find rst2html.

	* configure.ac: Check for rst2html.
	Define RST2HTML and use it...
	* doc/Makefile.am (contributors.html): ...here.

ChangeLog

+2013-06-28  Roland Levillain  <roland@lrde.epita.fr>
+
+	Have configure find rst2html.
+
+	* configure.ac: Check for rst2html.
+	Define RST2HTML and use it...
+	* doc/Makefile.am (contributors.html): ...here.
+
 2013-06-18  Roland Levillain  <roland@lrde.epita.fr>
 
 	Mention bibtex2html and bib2bib as documentation build dependencies.

configure.ac

@@ -160,6 +160,25 @@ if test -z "$TESTS_CXXFLAGS_DEBUG"; then
 fi
 
 
+## --------------- ##
+## Documentation.  ##
+## --------------- ##
+
+# Tools used to build the documentation.
+
+# rst2html can have many names, especially in the MacPorts, where
+# py-docutils binaries include their version numbers in their names.
+AC_ARG_VAR([RST2HTML], [reStructuredText-to-HTML translator])
+AC_CHECK_PROGS([RST2HTML],
+  m4_do([rst2html],
+        [ rst2html.py],
+        [ rst2html-3.3.py rst2html-3.2.py rst2html-3.1.py],
+        [ rst2html-2.7.py rst2html-2.6.py rst2html-2.5.py rst2html-2.4.py]))
+if test -z "$RST2HTML"; then
+  AC_MSG_WARN([rst2html not found, documentation rebuild will not be possible])
+fi
+
+
 ## ------------------------------ ##
 ## ``Enable Everything'' Switch.  ##
 ## ------------------------------ ##

doc/Makefile.am

@@ -149,9 +149,12 @@ EXTRA_DIST += $(USER_REFMAN)
 ## -------------- ##
 
 contributors.html: $(top_srcdir)/AUTHORS
-	rst2html --stylesheet-path=$(srcdir)/doxygen.css --link-stylesheet \
-		 --input-encoding=latin1 --output-encoding=latin1 \
-		 $(top_srcdir)/AUTHORS > contributors.html
+	@test -n "$(RST2HTML)"						\
+	  || { echo "error: rst2html not found during configure" >&2;	\
+	       exit 1; }
+	$(RST2HTML) --input-encoding=latin1 --output-encoding=latin1	\
+	  --stylesheet-path=$(srcdir)/doxygen.css --link-stylesheet	\
+	  $< >$@
 
 
 ## -------------- ##