xpadneo, installer: Fix usage of ETC_PREFIX

Signed-off-by: Kai Krakow <[email protected]>

Makefile

@@ -8,7 +8,7 @@ else
   DKMS ?= : SKIPPING dkms
 endif
 
-ETC_PREFIX ?= $(PREFIX)/etc
+ETC_PREFIX ?= /etc
 
 all: build
 
@@ -21,7 +21,7 @@ help:
 	@echo
 	@echo "Variables:"
 	@echo "PREFIX      Install files into this prefix"
-	@echo "ETC_PREFIX  Install etc files into this prefix (defaults to \$PREFIX/etc)"
+	@echo "ETC_PREFIX  Install etc files relative to the prefix (defaults to /etc)"
 	@echo
 	@echo "Using PREFIX requires handling dkms commands in your package script."
 
@@ -36,14 +36,15 @@ build: VERSION
 	$(MAKE) VERSION="$(shell cat VERSION)" -C hid-xpadneo dkms.conf
 
 install: build
-	mkdir -p $(PREFIX)/etc/modprobe.d $(PREFIX)/etc/udev/rules.d
-	install -D -m 0644 -t $(PREFIX)/etc/modprobe.d $(MODPROBE_CONFS:%=hid-xpadneo/etc-modprobe.d/%)
-	install -D -m 0644 -t $(PREFIX)/etc/udev/rules.d $(UDEV_RULES:%=hid-xpadneo/etc-udev-rules.d/%)
+	mkdir -p $(PREFIX)$(ETC_PREFIX)/modprobe.d $(PREFIX)$(ETC_PREFIX)/udev/rules.d
+	install -D -m 0644 -t $(PREFIX)$(ETC_PREFIX)/modprobe.d $(MODPROBE_CONFS:%=hid-xpadneo/etc-modprobe.d/%)
+	install -D -m 0644 -t $(PREFIX)$(ETC_PREFIX)/udev/rules.d $(UDEV_RULES:%=hid-xpadneo/etc-udev-rules.d/%)
 	$(DKMS) add hid-xpadneo
 
 uninstall: VERSION
 	$(DKMS) remove "hid-xpadneo/$(shell cat VERSION)" --all
 	rm -Rf "$(PREFIX)/usr/src/hid-xpadneo-$(shell cat VERSION)"
 	rm -f $(PREFIX)$(UDEV_RULES:%=$(ETC_PREFIX)/udev/rules.d/%)
-	rm -f $(PREFIX)$(MODPROBE_CONFS:%=$(ETC_PREFIX)/modprobe.d/%)
-	rmdir --ignore-fail-on-non-empty -p $(PREFIX)/etc/modprobe.d $(PREFIX)/etc/udev/rules.d
+	rm -f $(UDEV_RULES:%=$(PREFIX)$(ETC_PREFIX)/udev/rules.d/%)
+	rm -f $(MODPROBE_CONFS:%=$(PREFIX)$(ETC_PREFIX)/modprobe.d/%)
+	rmdir --ignore-fail-on-non-empty -p $(PREFIX)$(ETC_PREFIX)/modprobe.d $(PREFIX)$(ETC_PREFIX)/udev/rules.d