Reordering to get prerequisites right

Makefile

@@ -25,11 +25,6 @@ ifeq (true,$(LINEWRAP))
 	  (echo $(INPUT)" has lines not wrapped at "$(LINEWRAPLENGTH)" characters" && false)
 endif
 
-$(OUTPUT): $(INPUT) $(SUPPORTDIR)/respec $(BUILD_FILES)
-	phantomjs --ignore-ssl-errors=true --ssl-protocol=tlsv1 $(SUPPORTDIR)/respec/tools/respec2html.js -e -w $< $@
-
-$(warning BUILD_FILES = $(BUILD_FILES))
-
 .PHONY: webidl
 webidl: $(OUTPUT) $(SUPPORTDIR)/webidl-checker $(WIDLPROC_PATH)
 	WIDLPROC_PATH=$(WIDLPROC_PATH) python $(SUPPORTDIR)/webidl-checker/webidl-check $< > /dev/null
@@ -77,14 +72,18 @@ update:: force_update $(foreach repo,$(REPOS),$(call to_dir,$(repo))) $(tidy) $(
 force_update::
 	@touch $(SUPPORTDIR)/repos.mk
 
-## Copy auxiliary files listed in W3CTRMANIFEST
+## Build a processed copy of the spec
 
 BUILD_INPUT = $(shell tail -n +2 W3CTRMANIFEST)
 BUILD_FILES = $(addprefix $(BUILDDIR)/,$(BUILD_INPUT))
 include $(SUPPORTDIR)/build.mk
 $(SUPPORTDIR)/build.mk: W3CTRMANIFEST $(SUPPORTDIR)
 	@echo ' $(foreach f,$(BUILD_INPUT),$(BUILDDIR)/$(f): $(f) $(BUILDDIR)\n\tcp -f $$< $$@\n)' > $@
 
+$(OUTPUT): $(INPUT) $(SUPPORTDIR)/respec $(BUILD_FILES)
+	phantomjs --ignore-ssl-errors=true --ssl-protocol=tlsv1 $(SUPPORTDIR)/respec/tools/respec2html.js -e -w $< $@
+
+
 ## Machine setup
 
 .PHONY: travissetup