depend on the awk script that generates it as well.
colortbl.h : color_lib
$(AWK) -f $(top_srcdir)/awk/colortbl.awk color_lib > colortbl.h
-color_lib : $(top_srcdir)/lib/common/color_names
+color_lib : brewer_lib $(top_srcdir)/lib/common/color_names
cat brewer_lib $(top_srcdir)/lib/common/color_names | LC_COLLATE=C $(SORT) > color_lib
-brewer_lib : $(top_srcdir)/lib/common/brewer_colors
+brewer_lib : $(top_srcdir)/lib/common/brewer_colors $(top_srcdir)/awk/brewer.awk
$(AWK) -f $(top_srcdir)/awk/brewer.awk $(top_srcdir)/lib/common/brewer_colors > brewer_lib
htmllex.o htmllex.lo: htmllex.c htmllex.h htmlparse.h