Create dep directory on Makefile launch

Makefile

@@ -13,6 +13,7 @@ include $(RACK_DIR)/plugin.mk
 
 # Dependencies
 
+$(shell mkdir -p dep)
 DEP_FLAGS += -fPIC
 DEP_LOCAL := dep
 
@@ -20,7 +21,6 @@ DEPS += $(libsamplerate)
 include $(RACK_DIR)/dep.mk
 
 $(libsamplerate):
-	mkdir -p dep
 	cd dep && $(WGET) http://www.mega-nerd.com/SRC/libsamplerate-0.1.9.tar.gz
 	cd dep && $(UNTAR) libsamplerate-0.1.9.tar.gz
 	cd dep/libsamplerate-0.1.9 && $(CONFIGURE)