diff --git a/spirv-tools.changes b/spirv-tools.changes
index 5ebd7eb..1da2a67 100644
--- a/spirv-tools.changes
+++ b/spirv-tools.changes
@@ -1,3 +1,10 @@
+-------------------------------------------------------------------
+Thu Jan  4 15:47:38 UTC 2018 - tchvatal@suse.com
+
+- Make sure to build just with python3
+- Remove needles buildroot variable and default defattrs
+- Use autopatch to apply patches
+
 -------------------------------------------------------------------
 Fri Nov 17 13:32:51 UTC 2017 - jengelh@inai.de
 
diff --git a/spirv-tools.spec b/spirv-tools.spec
index eba55bb..9c1ef5f 100644
--- a/spirv-tools.spec
+++ b/spirv-tools.spec
@@ -1,7 +1,7 @@
 #
 # spec file for package spirv-tools
 #
-# 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
@@ -35,9 +35,8 @@ BuildRoot:      %{_tmppath}/%{name}-%{version}-build
 BuildRequires:  bison
 BuildRequires:  cmake >= 2.8.12
 BuildRequires:  gcc-c++
-BuildRequires:  python
-BuildRequires:  python-xml
-BuildRequires:  python3
+BuildRequires:  python3-base
+BuildRequires:  python3-xml
 BuildRequires:  spirv-headers >= 1.2
 
 %description
@@ -67,33 +66,29 @@ integration into other code bases directly.
 
 %prep
 %setup -q
-%patch -P 1 -P 2 -p1
+%autopatch -p1
 
 %build
 %cmake -D"SPIRV-Headers_SOURCE_DIR=%_prefix" -DSPIRV_BUILD_COMPRESSION=BOOL:ON
 make %{?_smp_mflags}
 
 %install
-b="%buildroot"
 %cmake_install
 
 %post   -n %lname -p /sbin/ldconfig
 %postun -n %lname -p /sbin/ldconfig
 
 %files
-%defattr(-,root,root)
 %_bindir/spirv-*
 %doc LICENSE
 
 %files -n %lname
-%defattr(-,root,root)
 %_libdir/libSPIRV-Tools.so.*
 %_libdir/libSPIRV-Tools-comp.so.*
 %_libdir/libSPIRV-Tools-link.so.*
 %_libdir/libSPIRV-Tools-opt.so.*
 
 %files devel
-%defattr(-,root,root)
 %_libdir/libSPIRV-Tools.so
 %_libdir/libSPIRV-Tools-comp.so
 %_libdir/libSPIRV-Tools-link.so