diff -urN a/Makefile b/Makefile
--- a/Makefile	2024-02-08 11:25:35.000000000 +0000
+++ b/Makefile	2024-03-02 20:26:12.000000000 +0000
@@ -8,7 +8,12 @@
 # Flags for use with the Linux ncurses package (recommended)
 CFLAGS = -g -DNDEBUG
 TERMLIB = -lncurses
-CC = gcc
+
+PREFIX ?= /usr
+BINDIR := $(PREFIX)/bin
+MANDIR := $(PREFIX)/share/man/man6
+
+all: galaxis
 
 galaxis: galaxis.c
 	$(CC) $(CFLAGS) -o galaxis galaxis.c $(TERMLIB)
@@ -25,13 +30,13 @@
 	asciidoctor -D. -a nofooter -a webfonts! $<
 
 install: galaxis.6 uninstall
-	install -m 755 -o 0 -g 0 -d $(ROOT)/usr/bin/
-	install -m 755 -o 0 -g 0 galaxis $(ROOT)/usr/bin/galaxis
-	install -m 755 -o 0 -g 0 -d $(ROOT)/usr/share/man/man6/
-	install -m 755 -o 0 -g 0 galaxis.6 $(ROOT)/usr/share/man/man6/galaxis.6
+	install -m 755 -d $(DESTDIR)$(BINDIR)
+	install -m 755 galaxis $(DESTDIR)$(BINDIR)
+	install -m 755 -d $(DESTDIR)$(MANDIR)
+	install -m 755 galaxis.6 $(DESTDIR)$(MANDIR)
 
 uninstall:
-	rm -f ${ROOT}/usr/bin/galaxis ${ROOT}/usr/share/man/man6/galaxis.6
+	rm -f $(DESTDIR)$(BINDIR)/galaxis $(DESTDIR)$(MANDIR)/galaxis.6
 
 clean:
 	rm -f galaxis galaxis.6 galaxis-*.tar.gz *~ *.html