squashfs-tools: fixed to disable xattr support if the attr package is not effectively installed

filesystem/squashfs-tools/squashfs-tools.conf

@@ -16,5 +16,12 @@
 makeinstopt=
 
 hook_add preconf 2 'cd squashfs-tools'
+
+# xattr support
+if ! pkginstalled -f attr; then
+	var_append makeopt ' ' "XATTR_SUPPORT=0"
+	var_append makeopt ' ' "XATTR_DEFAULT=0"
+fi
+
 hook_add postmake 5 "install {mk,un}squashfs $root$sbindir/"