check for emacs-etags, and etags, and set @ETAGS@ as needed.

Makefile.in

@@ -50,4 +50,4 @@ kitclean: distclean
 
 tags:
 	rm -f TAGS
-	find lib bin -name "*.[ch]" -print | etags -
+	find lib bin -name "*.[ch]" -print | @ETAGS@ -

configure.in

@@ -13,7 +13,7 @@
 # ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
 # SOFTWARE.
 
-AC_REVISION($Revision: 1.104 $)
+AC_REVISION($Revision: 1.105 $)
 
 AC_PREREQ(2.13)
 
@@ -38,6 +38,9 @@ ARFLAGS="cruv"
 AC_SUBST(AR)
 AC_SUBST(ARFLAGS)
 
+AC_PATH_PROGS(ETAGS, etags emacs-etags)
+AC_SUBST(ETAGS)
+
 #
 # Special processing of paths depending on whether --prefix,
 # --sysconfdir or --localstatedir arguments were given.  What's