set default PREFIX to /usr again (rather than /) after applying the last patch, added DESTDIR as well, makes things more compatible with how suckless does things

Makefile

@@ -1,4 +1,4 @@
-PREFIX:=/
+PREFIX:=/usr
 
 .PHONY: install shellcheck
 
@@ -33,25 +33,25 @@ clean:
 	rm programs/sxmo_setpineled programs/sxmo_screenlock programs/sxmo_setpinebacklight programs/sxmo_megiaudioroute programs/sxmo_vibratepine
 
 install: $(PROGRAMS)
-	cd configs && find . -type f -exec install -D -m 0644 "{}" "$(PREFIX)/usr/share/sxmo/{}" \; && cd ..
+	cd configs && find . -type f -exec install -D -m 0644 "{}" "$(DESTDIR)$(PREFIX)/share/sxmo/{}" \; && cd ..
 
 	# Configs
-	install -D -m 0644 -t $(PREFIX)/etc/alsa/conf.d/ configs/alsa/alsa_sxmo_enable_dmix.conf
+	install -D -m 0644 -t $(DESTDIR)$(PREFIX)/etc/alsa/conf.d/ configs/alsa/alsa_sxmo_enable_dmix.conf
 
-	install -D -m 0644 -t $(PREFIX)/etc/polkit-1/rules.d/ configs/polkit/*.rules
+	install -D -m 0644 -t $(DESTDIR)$(PREFIX)/etc/polkit-1/rules.d/ configs/polkit/*.rules
 
-	install -D -m 0644 -t $(PREFIX)/etc/udev/rules.d/ configs/udev/*.rules
+	install -D -m 0644 -t $(DESTDIR)$(PREFIX)/etc/udev/rules.d/ configs/udev/*.rules
 
-	install -D -m 0644 -t $(PREFIX)/usr/share/applications/ configs/xdg/mimeapps.list
+	install -D -m 0644 -t $(DESTDIR)$(PREFIX)/share/applications/ configs/xdg/mimeapps.list
 
 	# Bin
-	install -D -t $(PREFIX)/usr/bin scripts/*/*
+	install -D -t $(DESTDIR)$(PREFIX)/bin scripts/*/*
 
-	install -D -o root -m 4755 programs/sxmo_setpineled $(PREFIX)/usr/bin/
+	install -D -o root -m 4755 programs/sxmo_setpineled $(DESTDIR)$(PREFIX)/bin/
 
-	install -D -o root -m 4755 programs/sxmo_setpinebacklight $(PREFIX)/usr/bin/
+	install -D -o root -m 4755 programs/sxmo_setpinebacklight $(DESTDIR)$(PREFIX)/bin/
 
-	install -D -o root -m 4755 programs/sxmo_screenlock $(PREFIX)/usr/bin/
+	install -D -o root -m 4755 programs/sxmo_screenlock $(DESTDIR)$(PREFIX)/bin/
 
-	install -D programs/sxmo_megiaudioroute $(PREFIX)/usr/bin/
-	install -D programs/sxmo_vibratepine $(PREFIX)/usr/bin/
+	install -D programs/sxmo_megiaudioroute $(DESTDIR)$(PREFIX)/bin/
+	install -D programs/sxmo_vibratepine $(DESTDIR)$(PREFIX)/bin/