Makefile conventions (at least in the GNUish world) tend to control the
base install directory with the variable $(PREFIX) (all caps).  The passt
Makefile has the same thing but in lower case $(prefix).  Capitalize it to
match conventions.

Signed-off-by: David Gibson <david(a)gibson.dropbear.id.au>
---
 Makefile | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/Makefile b/Makefile
index b0dde68..c334605 100644
--- a/Makefile
+++ b/Makefile
@@ -82,7 +82,7 @@ ifeq ($(shell :|$(CC) -fstack-protector-strong -S -xc - -o - >/dev/null 2>&1; ec
 	CFLAGS += -fstack-protector-strong
 endif
 
-prefix ?= /usr/local
+PREFIX ?= /usr/local
 
 ifeq ($(TARGET_ARCH),X86_64)
 BIN := passt passt.avx2 pasta pasta.avx2 qrap
@@ -125,13 +125,13 @@ clean:
 		passt.tar passt.tar.gz *.deb *.rpm
 
 install: $(BIN) $(MANPAGES)
-	mkdir -p $(DESTDIR)$(prefix)/bin $(DESTDIR)$(prefix)/share/man/man1
-	cp -d $(BIN) $(DESTDIR)$(prefix)/bin
-	cp -d $(MANPAGES) $(DESTDIR)$(prefix)/share/man/man1
+	mkdir -p $(DESTDIR)$(PREFIX)/bin $(DESTDIR)$(PREFIX)/share/man/man1
+	cp -d $(BIN) $(DESTDIR)$(PREFIX)/bin
+	cp -d $(MANPAGES) $(DESTDIR)$(PREFIX)/share/man/man1
 
 uninstall:
-	$(RM) $(BIN:%=$(DESTDIR)$(prefix)/bin/%)
-	$(RM) $(MANPAGES:%=$(DESTDIR)$(prefix)/share/man/man1/%)
+	$(RM) $(BIN:%=$(DESTDIR)$(PREFIX)/bin/%)
+	$(RM) $(MANPAGES:%=$(DESTDIR)$(PREFIX)/share/man/man1/%)
 
 pkgs: static
 	tar cf passt.tar -P --xform 's//\/usr\/bin\//' $(BIN)
-- 
2.36.1