Use conventional directory variables in Makefile

Author: florentc

Makefile

@@ -7,11 +7,14 @@ MANPAGE = doc/xob.1
 SOURCES = $(wildcard src/*.c)
 OBJECTS = $(SOURCES:.c=.o)
 
-INSTALL_PROGRAM = install
-INSTALL_DATA    = install --mode=644
-PREFIX         ?= /usr
-BINPREFIX      ?= $(PREFIX)/bin
-MANPREFIX      ?= $(PREFIX)/share/man
+INSTALL         ?= install
+INSTALL_PROGRAM ?= $(INSTALL)
+INSTALL_DATA    ?= $(INSTALL) -m 644
+prefix          ?= /usr/local
+bindir          ?= $(prefix)/bin
+datarootdir     ?= $(prefix)/share
+mandir          ?= $(datarootdir)/man
+man1dir         ?= $(mandir)/man1
 
 all: $(PROGRAM)
 
@@ -22,14 +25,14 @@ $(PROGRAM): $(OBJECTS)
 	$(CC) $(CFLAGS) -c -o $@ $<
 
 install: $(PROGRAM) $(MANPAGE)
-	mkdir --parents "$(DESTDIR)$(BINPREFIX)"
-	$(INSTALL_PROGRAM) "$(PROGRAM)" -t "$(DESTDIR)$(BINPREFIX)"
-	mkdir --parents "$(DESTDIR)$(MANPREFIX)/man1"
-	$(INSTALL_DATA) "$(MANPAGE)" -t "$(DESTDIR)$(MANPREFIX)/man1"
+	mkdir --parents "$(DESTDIR)$(bindir)"
+	$(INSTALL_PROGRAM) "$(PROGRAM)" -t "$(DESTDIR)$(bindir)"
+	mkdir --parents "$(DESTDIR)$(man1dir)"
+	$(INSTALL_DATA) "$(MANPAGE)" -t "$(DESTDIR)$(man1dir)"
 
 uninstall:
-	rm -f "$(DESTDIR)$(BINPREFIX)/$(PROGRAM)"
-	rm -f "$(DESTDIR)$(MANPREFIX)/man1/$(MANPAGE)"
+	rm -f "$(DESTDIR)$(bindir)/$(PROGRAM)"
+	rm -f "$(DESTDIR)$(man1dir)/$(MANPAGE)"
 
 clean:
 	rm -f $(OBJECTS)