Makefile needed an action for a the dummpy rule to avoid the default action

assumed by GNU Make ( get ctype.c), which conflicted with bitkeeper

strings/Makefile.am

@@ -65,6 +65,9 @@ OMIT_DEPENDENCIES =	pthread.h stdio.h __stdio.h stdlib.h __stdlib.h math.h\
 
 libmystrings_a_LIBADD=	@CHARSET_OBJS@
 ctype.c:		ctype_extra_sources.c
+#we need a dummy rule to make GNUMake get along with bitkeeper
+	echo '' >/dev/null
+
 ctype_extra_sources.c: conf_to_src
 	./conf_to_src $(top_srcdir) @CHARSETS_NEED_SOURCE@ > \
 	              $(srcdir)/ctype_extra_sources.c