Output date into the stamp file, so that mercurial's copy of stamp is always newer than the sources; and do not abort if txt2tags wasn't found

doc/Makefile.am

@@ -30,7 +30,7 @@ stamp-help: $(t2t_sources) makedocs
 	rm -fr help && \
 	$(mkdir_p) help && \
 	$(srcdir)/makedocs $(srcdir)/medit.t2t && \
-	echo stamp > stamp-help
+	echo `date` > stamp-help
 
 medit.lo: build-docs
 prefs.lo: build-docs

doc/makedocs

@@ -23,6 +23,11 @@ if test ! -e "$outdir"; then
   exit 1
 fi
 
+txt2tags --version >/dev/null 2>/dev/null || {
+  echo "*** WARNING: txt2tags has not been found, docs will not be regenerated ***" >&2
+  exit 0
+}
+
 generate () {
   $T2T --outfile=$2 $1 || exit 1
   (cd "$outdir" && $SPLITY -index $SPLITY_INDEX -page $SPLITY_PAGE $2) || exit 1

doc/stamp-help

@@ -1 +1 @@
-stamp
+Fri Sep 5 13:44:58 CDT 2008