xbps-src: tar and xz are required in host system.

xbps-src/xbps-src.sh.in

@@ -34,11 +34,14 @@
 : ${xbps_machine:=$(uname -m)}
 : ${XBPS_UTILS_REQVER:=20100511}
 
+# Required utilities in host system.
+REQHOST_UTILS="gawk bash sed gcc msgfmt patch makeinfo perl fakeroot tar xz"
+
 check_reqhost_utils()
 {
 	[ -n "$in_chroot" ] && return 0
 
-	for f in gawk bash sed gcc msgfmt patch makeinfo perl fakeroot; do
+	for f in ${REQHOST_UTILS}; do
 		if ! command -v ${f} 2>&1 >/dev/null; then
 			echo "${f} is missing in your system, can't continue! exiting..."
 			exit 1