Index: Makefile
--- Makefile.orig
+++ Makefile
@@ -8,7 +8,9 @@ JAVA ?= java
 
 # Variables
 
-DESTDIR ?= deploy
+ifeq ($(DESTDIR),)
+DESTDIR := deploy
+endif
 
 # Javascript compiler
 
@@ -102,7 +104,7 @@ js: $(JSDEPLOY)/fingerprint.js $(JSDEPLOY)/resize.js $
 	# TODO use separate targets
 
 $(DESTDIR)/%.php: %.php
-	php -l $<
+	$(PHP) -l $<
 	mkdir -p $$(dirname $@)
 	cp $< $@
 
@@ -288,11 +290,11 @@ tokenizr: node_modules
 
 .PHONY: plugins
 plugins:
-	make -C plugins
+	$(MAKE) -C plugins
 
 .PHONY: clean
 clean:
-	make -C plugins clean
+	$(MAKE) -C plugins clean
 	@rm -rf deploy
 	@rm -rf node_modules