diff --git a/gtkglext.changes b/gtkglext.changes
index 49027cf..f769f55 100644
--- a/gtkglext.changes
+++ b/gtkglext.changes
@@ -1,3 +1,8 @@
+-------------------------------------------------------------------
+Wed Feb 28 16:32:33 UTC 2018 - dimstar@opensuse.org
+
+- Modernize spec-file by calling spec-cleaner
+
 -------------------------------------------------------------------
 Thu Jun 29 10:48:08 UTC 2017 - jengelh@inai.de
 
diff --git a/gtkglext.spec b/gtkglext.spec
index 3d6b45b..7ed7bac 100644
--- a/gtkglext.spec
+++ b/gtkglext.spec
@@ -1,7 +1,7 @@
 #
 # spec file for package gtkglext
 #
-# Copyright (c) 2017 SUSE LINUX GmbH, Nuernberg, Germany.
+# Copyright (c) 2018 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
@@ -16,15 +16,15 @@
 #
 
 
-Name:           gtkglext
 %define git_commit 8c13cc48
 %define git_date 20110529
+Name:           gtkglext
 Version:        1.2.0git%{git_date}
 Release:        0
 Summary:        OpenGL Extension to GTK
-License:        LGPL-2.1+ and GPL-2.0+
+License:        LGPL-2.1-or-later AND GPL-2.0-or-later
 Group:          Development/Libraries/C and C++
-Url:            http://projects.gnome.org/gtkglext/
+URL:            http://projects.gnome.org/gtkglext/
 # git clone git://git.gnome.org/gtkglext
 # git archive %{git_commit} --prefix=gtkglext-git%{git_date}/ | bzip2 > ../gtkglext-git%{git_date}.tar.bz2
 Source:         %{name}-git%{git_date}.tar.bz2
@@ -36,8 +36,8 @@ BuildRequires:  freeglut-devel
 BuildRequires:  gtk-doc
 BuildRequires:  libdrm-devel
 BuildRequires:  libtool
+BuildRequires:  pkgconfig
 BuildRequires:  pkgconfig(gtk+-2.0) >= 2.20
-BuildRoot:      %{_tmppath}/%{name}-%{version}-build
 
 %description
 GtkGLExt is an OpenGL extension to GTK. It provides the GDK objects
@@ -46,7 +46,7 @@ GTK+ widgets OpenGL-capable.
 
 %package -n libgtkglext-x11-1_0-0
 Summary:        OpenGL Extension to GTK
-License:        LGPL-2.1+
+License:        LGPL-2.1-or-later
 Group:          System/Libraries
 Provides:       %{name} = %{version}
 Obsoletes:      %{name} < %{version}
@@ -58,7 +58,7 @@ GTK+ widgets OpenGL-capable.
 
 %package devel
 Summary:        OpenGL Extension to GTK
-License:        LGPL-2.1+
+License:        LGPL-2.1-or-later
 Group:          Development/Libraries/C and C++
 Requires:       Mesa-devel
 Requires:       libgtkglext-x11-1_0-0 = %{version}
@@ -73,7 +73,7 @@ make GTK+ widgets OpenGL-capable.
 
 %package doc
 Summary:        Documentation of the OpenGL Extension to GTK
-License:        LGPL-2.1+
+License:        LGPL-2.1-or-later
 Group:          Documentation/HTML
 Requires:       libgtkglext-x11-1_0-0 = %{version}
 
@@ -96,21 +96,19 @@ make %{?_smp_mflags}
 
 %install
 %make_install
-rm -f %{buildroot}%{_libdir}/*.la
+find %{buildroot} -type f -name "*.la" -delete -print
 
 %post -n libgtkglext-x11-1_0-0 -p /sbin/ldconfig
-
 %postun -n libgtkglext-x11-1_0-0 -p /sbin/ldconfig
 
 %files -n libgtkglext-x11-1_0-0
-%defattr (-, root, root)
 # NEWS is empty
-%doc AUTHORS COPYING COPYING.LIB README TODO
+%license COPYING
+%doc AUTHORS README TODO
 %{_libdir}/libgdkglext-x11-1.0.so.*
 %{_libdir}/libgtkglext-x11-1.0.so.*
 
 %files devel
-%defattr (-, root, root)
 # %{_datadir}/aclocal/gtkglext-1.0.m4
 %{_libdir}/gtkglext-1.0/
 %{_libdir}/libgdkglext-x11-1.0.so
@@ -122,7 +120,6 @@ rm -f %{buildroot}%{_libdir}/*.la
 %{_includedir}/gtkglext-1.0/
 
 %files doc
-%defattr (-, root, root)
 %doc %{_datadir}/gtk-doc/html/gtkglext/
 
 %changelog