diff -Naur a/lib/Makefile.in b/lib/Makefile.in
--- a/lib/Makefile.in	2015-03-13 22:44:43.967266167 -0700
+++ b/lib/Makefile.in	2015-03-13 22:47:05.496603070 -0700
@@ -301,7 +301,7 @@
 	\
 	route/pktloc_syntax.c route/pktloc_grammar.c route/pktloc.c
 
-all: defs.h
+all: defs.h route/pktloc_syntax.h route/pktloc_grammar.h
 	$(MAKE) $(AM_MAKEFLAGS) all-am
 
 .SUFFIXES:
@@ -977,9 +977,11 @@
 
 # Hack to avoid using ylwrap. It does not function correctly in combination
 # with --header-file=
+route/pktloc_grammar.h: route/pktloc_grammar.c
 route/pktloc_grammar.c: route/pktloc_grammar.l
 	$(LEX) --header-file=route/pktloc_grammar.h $(LFLAGS) -o $@ $^
 
+route/pktloc_syntax.h: route/pktloc_syntax.c
 route/pktloc_syntax.c: route/pktloc_syntax.y
 	$(YACC) -d $(YFLAGS) -o $@ $^