--- Makefile.orig	2024-10-05 16:57:31 UTC
+++ Makefile
@@ -20,7 +20,7 @@ LIBS = -lncurses
 # You shouldn't have to modify anything below this line.
 
 # There's a dynamic format in the object-display routines; suppress the warning
-CFLAGS = $(DEBUG) $(PROFILE) -Wall -Wno-format-security
+CFLAGS ?= $(DEBUG) $(PROFILE) -Wall -Wno-format-security
 
 FILES = \
 	attack.c \
@@ -93,16 +93,16 @@ install: empire.6 uninstall
 	@cppcheck --quiet --inline-suppr --suppress=missingIncludeSystem --suppress=unusedFunction --template gcc --enable=all --force *.[ch]
 
 install: empire.6 uninstall
-	install -m 0755 -d $(DESTDIR)/usr/bin
-	install -m 0755 -d $(DESTDIR)/usr/share/man/man6
-	install -m 0755 -d $(DESTDIR)/usr/share/applications/
-	install -m 0755 -d $(DESTDIR)/usr/share/icons/hicolor/48x48/apps/
-	install -m 0755 -d $(DESTDIR)/usr/share/appdata
-	install -m 0755 vms-empire $(DESTDIR)/usr/bin/
-	install -m 0644 empire.6 $(DESTDIR)/usr/share/man/man6/vms-empire.6
-	install -m 0644 vms-empire.desktop $(DESTDIR)/usr/share/applications/
-	install -m 0644 vms-empire.png $(DESTDIR)/usr/share/icons/hicolor/48x48/apps/
-	install -m 0644 vms-empire.xml $(DESTDIR)/usr/share/appdata/
+	install -m 0755 -d $(DESTDIR)$(PREFIX)/bin
+	install -m 0755 -d $(DESTDIR)$(PREFIX)/share/man/man6
+	install -m 0755 -d $(DESTDIR)$(PREFIX)/share/applications/
+	install -m 0755 -d $(DESTDIR)$(PREFIX)/share/icons/hicolor/48x48/apps/
+	install -m 0755 -d $(DESTDIR)$(PREFIX)/share/appdata
+	install -m 0755 vms-empire $(DESTDIR)$(PREFIX)/bin/
+	install -m 0644 empire.6 $(DESTDIR)$(PREFIX)/share/man/man6/vms-empire.6
+	install -m 0644 vms-empire.desktop $(DESTDIR)$(PREFIX)/share/applications/
+	install -m 0644 vms-empire.png $(DESTDIR)$(PREFIX)/share/icons/hicolor/48x48/apps/
+	install -m 0644 vms-empire.xml $(DESTDIR)$(PREFIX)/share/appdata/
 
 uninstall:
 	rm -f /usr/bin/vms-empire /usr/share/man/man6/vms-empire.6