Makefile improvements

Author: VorpalBlade

Makefile

@@ -1,10 +1,13 @@
 # This makefile exists to allow for an install target, since it seems
 # cargo install is too basic to handle installing system services properly.
 
+CARGO_FLAGS ?=
 DESTDIR ?=
 PREFIX ?= /usr/local
 BINDIR ?= $(PREFIX)/bin
-CONFDIR ?= $(PREFIX)/etc/conf.d
+ETCDIR ?= $(PREFIX)/etc
+
+CONFDIR ?= $(ETCDIR)/conf.d
 SYSTEMDDIR ?= $(PREFIX)/lib/systemd/system
 
 PROG := target/release/keyboard-backlightd
@@ -13,7 +16,7 @@ all: $(PROG)
 
 $(PROG):
 	# Let cargo figure out if a build is needed
-	cargo build --release
+	cargo build --release $(CARGO_FLAGS)
 
 etc/keyboard-backlightd.service: etc/keyboard-backlightd.service.in Makefile
 	sed -e "s#{BINDIR}#$(BINDIR)#" -e "s#{PREFIX}#$(PREFIX)#" $< > $@