File project.diff of Package isl

--- isl.spec.orig
+++ isl.spec
@@ -1,7 +1,7 @@
 #
 # spec file for package isl
 #
-# Copyright (c) 2018 SUSE LINUX GmbH, Nuernberg, Germany.
+# Copyright (c) 2019 SUSE LINUX GmbH, Nuernberg, Germany.
 #
 # All modifications and additions to the file contributed by third parties
 # remain the property of their copyright owners, unless otherwise agreed
@@ -28,6 +28,7 @@ Source:         http://isl.gforge.inria.
 Source1:        baselibs.conf
 BuildRequires:  gmp-devel
 BuildRequires:  pkgconfig
+BuildRequires:  xz
 BuildRoot:      %{_tmppath}/%{name}-%{version}-build
 
 %description