archlinux: ensure /usr/sbin is not use to follow archlinux packaging guidelines

archlinux/PKGBUILD

@@ -43,7 +43,7 @@ make all
 
 package() {
 
-make install DESTDIR=$pkgdir LIBDIR=/usr/lib
+make install DESTDIR=$pkgdir LIBDIR=/usr/lib SBINDIR=/usr/bin
 
 }
 

qmemman/Makefile

@@ -1,6 +1,7 @@
 CC=gcc
 CFLAGS=-Wall -Wextra -Werror -g -O3
 all:	meminfo-writer
+SBINDIR?=/usr/sbin
 
 _XENSTORE_H=$(shell ls /usr/include/xenstore.h)
 ifneq "$(_XENSTORE_H)" ""
@@ -10,7 +11,7 @@ endif
 meminfo-writer: meminfo-writer.o
 	$(CC) -g -o meminfo-writer meminfo-writer.o -lxenstore
 install:
-	install -D meminfo-writer $(DESTDIR)/usr/sbin/meminfo-writer
+	install -D meminfo-writer $(DESTDIR)/$(SBINDIR)/meminfo-writer
 ifeq (1,${DEBIANBUILD})
 	install -d $(DESTDIR)/lib/systemd/system/
 	install -m 0644 qubes-meminfo-writer.service $(DESTDIR)/lib/systemd/system/