Move dependencies to different make target

Makefile

@@ -12,12 +12,14 @@ include config.mk  # defines HTTPDUSER
 SCRIPTS := $(patsubst %,$(WWW_DIR)/js/%.js,$(SCRIPTS))
 STYLES  := $(patsubst %,$(WWW_DIR)/css/%.css,$(STYLES))
 
-.PHONY: all static min translations clean cleaner
+.PHONY: all deps static min translations clean cleaner
 
-all: $(LIB_DIR)/autoload.php static $(CACHE_DIR) translations
+all: static $(CACHE_DIR) translations
 
 # Dependencies
 
+deps: $(LIB_DIR)/autoload.php
+
 $(LIB_DIR)/autoload.php: $(LIB_DIR) composer.json
 	composer update
 
@@ -50,7 +52,7 @@ min: static
 # Tmp files
 
 $(CACHE_DIR):
-	mkdir $@
+	mkdir -p $@
 	setfacl -R -m u:$(HTTPDUSER):rwX -- $@
 
 # Gettext translations