diff --git a/Makefile b/Makefile
index 278d966..2b1abe5 100755
--- a/Makefile
+++ b/Makefile
@@ -23,29 +23,31 @@
 
 
 MANDIR ?= /usr/local/man
+SBINDIR = /sbin
+INSTALL = /usr/bin/install
 ALL = sgpio
 
 all: $(ALL)
 
 sgpio.o: sgpio.c
-	gcc -g -Wall -c sgpio.c
+	gcc $(CFLAGS) -g -Wall -c sgpio.c
 
 sgpio: sgpio.o
-	gcc -g sgpio.o -o sgpio
+	gcc $(LDFLAGS) -g sgpio.o -o sgpio
 
 clean:
 	rm -f sgpio.o sgpio
 
 install: $(ALL)
 	for i in $(ALL); do \
-		install $$i /sbin/$$i; \
+		$(INSTALL) $$i $(SBINDIR)/$$i; \
 	done
-	install -d $(MANDIR)/man1
-	install -m 0644 *.1 $(MANDIR)/man1
+	$(INSTALL) -d $(MANDIR)/man1
+	$(INSTALL) -m 0644 *.1 $(MANDIR)/man1
 
 uninstall:
 	for i in $(ALL); do \
-		rm -f /sbin/$$i; \
+		rm -f $(SBINDIR)/$$i; \
 	done
 	for i in $(ALL:=.1); do \
 		rm -f $(MANDIR)/man1/$$i; \