diff --git a/Makefile b/Makefile
index cb2607f..d79cbca 100644
--- a/Makefile
+++ b/Makefile
@@ -1,12 +1,14 @@
 PREFIX ?= /usr/local
-KEYRING_TARGET_DIR=$(DESTDIR)$(PREFIX)/share/pacman/keyrings/
-KEYRING_FILES=$(wildcard build/*.gpg) $(wildcard build/*-revoked) $(wildcard build/*-trusted)
-SCRIPT_TARGET_DIR=$(DESTDIR)$(PREFIX)/bin/
-SCRIPT_FILES=wkd_sync/archlinux-keyring-wkd-sync
-SYSTEMD_SYSTEM_UNIT_DIR=$(DESTDIR)$(shell pkgconf --variable systemd_system_unit_dir systemd)
-SYSTEMD_FILES=$(wildcard wkd_sync/*.service) $(wildcard wkd_sync/*.timer)
+KEYRING_TARGET_DIR ?= $(PREFIX)/share/pacman/keyrings/
+SCRIPT_TARGET_DIR ?= $(PREFIX)/bin/
+SYSTEMD_SYSTEM_UNIT_DIR ?= $(shell pkgconf --variable systemd_system_unit_dir systemd)
+KEYRING_FILE=archlinux.gpg
+KEYRING_REVOKED_FILE=archlinux-revoked
+KEYRING_TRUSTED_FILE=archlinux-trusted
+WKD_SYNC_SCRIPT=archlinux-keyring-wkd-sync
+WKD_SYNC_SERVICE=archlinux-keyring-wkd-sync.service
+WKD_SYNC_TIMER=archlinux-keyring-wkd-sync.timer
 SYSTEMD_TIMER_DIR=$(SYSTEMD_SYSTEM_UNIT_DIR)/timers.target.wants/
-SYSTEMD_TIMER_FILE=archlinux-keyring-wkd-sync.timer
 SOURCES := $(shell find keyring) $(shell find libkeyringctl -name '*.py' -or -type d) keyringctl
 
 all: build
@@ -36,14 +38,20 @@ clean:
 	rm -rf build
 
 install: build
-	install -vDm 644 $(KEYRING_FILES) -t $(KEYRING_TARGET_DIR)
-	install -vDm 755 $(SCRIPT_FILES) -t $(SCRIPT_TARGET_DIR)
-	install -vDm 644 $(SYSTEMD_FILES) -t $(SYSTEMD_SYSTEM_UNIT_DIR)
-	install -vdm 755 $(SYSTEMD_TIMER_DIR)
-	ln -sv ../$(SYSTEMD_TIMER_FILE) $(SYSTEMD_TIMER_DIR)/$(SYSTEMD_TIMER_FILE)
+	install -vDm 644 build/{$(KEYRING_FILE),$(KEYRING_REVOKED_FILE),$(KEYRING_TRUSTED_FILE)} -t $(DESTDIR)$(KEYRING_TARGET_DIR)
+	install -vDm 755 wkd_sync/$(WKD_SYNC_SCRIPT) -t $(DESTDIR)$(SCRIPT_TARGET_DIR)
+	install -vDm 644 wkd_sync/{$(WKD_SYNC_SERVICE),$(WKD_SYNC_TIMER)} -t $(DESTDIR)$(SYSTEMD_SYSTEM_UNIT_DIR)
+	install -vdm 755 $(DESTDIR)$(SYSTEMD_TIMER_DIR)
+	ln -sv ../$(WKD_SYNC_TIMER) $(DESTDIR)$(SYSTEMD_TIMER_DIR)/$(WKD_SYNC_TIMER)
 
 uninstall:
-	rm -f $(KEYRING_TARGET_DIR)/archlinux{.gpg,-trusted,-revoked}
-	rmdir -p --ignore-fail-on-non-empty $(KEYRING_TARGET_DIR)
+	rm -fv $(DESTDIR)$(KEYRING_TARGET_DIR)/{$(KEYRING_FILE),$(KEYRING_REVOKED_FILE),$(KEYRING_TRUSTED_FILE)}
+	rmdir -pv --ignore-fail-on-non-empty $(DESTDIR)$(KEYRING_TARGET_DIR)
+	rm -v $(DESTDIR)$(SCRIPT_TARGET_DIR)/$(WKD_SYNC_SCRIPT)
+	rmdir -pv --ignore-fail-on-non-empty $(DESTDIR)$(SCRIPT_TARGET_DIR)
+	rm -v $(DESTDIR)$(SYSTEMD_SYSTEM_UNIT_DIR)/{$(WKD_SYNC_SERVICE),$(WKD_SYNC_TIMER)}
+	rmdir -pv --ignore-fail-on-non-empty $(DESTDIR)$(SYSTEMD_SYSTEM_UNIT_DIR)
+	rm -v $(DESTDIR)$(SYSTEMD_TIMER_DIR)/$(WKD_SYNC_TIMER)
+	rmdir -pv --ignore-fail-on-non-empty $(DESTDIR)$(SYSTEMD_TIMER_DIR)
 
 .PHONY: all lint fmt check test clean install uninstall